-
question_answer1)
"Philadelphia chromosome'' is found in the patient suffering from
A)
Insomnia done
clear
B)
Leukaemia done
clear
C)
Hepatitis done
clear
D)
Albinism done
clear
View Solution play_arrow
-
question_answer2)
Number of sex chromosomes is normal in [MP PMT 1992]
A)
Super female done
clear
B)
Turner's syndrome done
clear
C)
Klinefelter's syndrome done
clear
D)
Down's syndrome done
clear
View Solution play_arrow
-
question_answer3)
Mating between two individuals differing in genotye to produce genetic variation is called [J&K CET 2005]
A)
Domestication done
clear
B)
Introduction done
clear
C)
Hybridisation done
clear
D)
Mutation done
clear
View Solution play_arrow
-
question_answer4)
The gene which increases the frequency of mutation in other gene is referred to as
A)
Mutator gene done
clear
B)
Mutagene done
clear
C)
Hypostatic gene done
clear
D)
Complementary gene done
clear
View Solution play_arrow
-
question_answer5)
If an albino man marries with a normal woman and 50 offsprings are albino and 50 are normal, the woman is [CPMT 1977; DPMT 1992; MP PMT 1998]
A)
Heterozygous normal done
clear
B)
Homozygous normal done
clear
C)
Heterozygous carrier done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer6)
If mother and father both are without pigments (albinism), then
A)
All the offsprings will be albinism done
clear
B)
Half of the offsprings will be albinism done
clear
C)
75% offsprings will be albinism done
clear
D)
No offspring will be albinism done
clear
View Solution play_arrow
-
question_answer7)
Traits controlled by genes located on autosomes are said to be [BHU 1985]
A)
Sex affected done
clear
B)
Sex influenced done
clear
C)
Sex linked done
clear
D)
Genetic traits done
clear
View Solution play_arrow
-
question_answer8)
Which one in man is a wholly genetic trait [CPMT 1977; AFMC 1985]
A)
Diptheria done
clear
B)
Leucoderma done
clear
C)
Albinism done
clear
D)
Tuberculosis done
clear
View Solution play_arrow
-
question_answer9)
Mongolism syndrome is caused by [AFMC 1985, 86]
A)
One extra chromosome done
clear
B)
One extra sex chromosome done
clear
C)
One extra chromosome in 21st pair done
clear
D)
One less sex chromosome done
clear
View Solution play_arrow
-
question_answer10)
To be evolutionary successful, a mutation must be [CPMT 1982; AFMC 1985; MP PMT 1996]
A)
Germplasm DNA done
clear
B)
Somatoplasm DNA done
clear
C)
Cytoplasm done
clear
D)
RNA done
clear
View Solution play_arrow
-
question_answer11)
In man, albinism is due to non-synthesis of melanin in the absence of [BHU 2003]
A)
Lysine done
clear
B)
Tyrosinase done
clear
C)
Luciferase done
clear
D)
Melanase done
clear
View Solution play_arrow
-
question_answer12)
The reason why some mutations which are harmful do not get eliminated from the gene pool, is that[AIIMS 1984]
A)
They have future survival value done
clear
B)
They are recessive and carried by heterozygous individuals done
clear
C)
They are dominant and show up more frequently done
clear
D)
Genetic drift occurs because of a small population area done
clear
View Solution play_arrow
-
question_answer13)
An abnormal male child is born to normal parents. This child shows a short neck, stubby hands, slanting eyes, permanently open mouth with projecting upper lip and short stature. This abnormality can be attributed to
A)
An extra Y chromosome done
clear
B)
An extra X chromosome done
clear
C)
An extra chromosome in the 21st pair of autosomes done
clear
D)
Absence of X chromosome leading to a total of 45 chromosomes instead of the normal 46 done
clear
View Solution play_arrow
-
question_answer14)
The reduction of one pair of chromosome in human is due to
A)
Fusion of two chromosomes into one done
clear
B)
Elimination done
clear
C)
Mutation done
clear
D)
Reproductive isolation done
clear
View Solution play_arrow
-
question_answer15)
Mongoloid condition is related to or In mongolism a patient shows [DPMT 1982; MP PMT 1995; CBSE PMT 2001]
A)
Monosomy done
clear
B)
Trisomy done
clear
C)
Nullisomy done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer16)
Which of the following is a genetic disease [CBSE PMT 1990; JIPMER 1993]
A)
Phenylketonuria done
clear
B)
Blindness done
clear
C)
Cataract done
clear
D)
Leprosy done
clear
View Solution play_arrow
-
question_answer17)
In Klinefelter's syndrome, what is generally the set of sex chromosome [DPMT 1982; CBSE PMT 1993; CPMT 1994; MP PMT 1994, 98, 2000, 02; AIIMS 2000; Kerala CET 2003; BVP 2003]
A)
XX done
clear
B)
XY done
clear
C)
XXY done
clear
D)
XYY done
clear
View Solution play_arrow
-
question_answer18)
Mutation is [MP PMT 1993]
A)
Sudden change in morphology done
clear
B)
Change in characters done
clear
C)
Change in heritable characters done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer19)
A person who is trisomic for twenty first pair of chromosomes is [BHU 1990; CPMT 1993, 2000; DPMT 1993; MP PMT 1993]
A)
Klinefelter's syndrome done
clear
B)
Down's syndrome done
clear
C)
Turner's syndrome done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer20)
The monosomic condition in human beings depicted as XO is referred to as [AIIMS 1985, 99; BHU 1983, 85; CPMT 1991; Pb. PMT 2000; JIPMER 2002; MP PMT 2002, 03]
A)
Criminal syndrome done
clear
B)
Down's syndrome done
clear
C)
Klinefelter's syndrome done
clear
D)
Turner's syndrome done
clear
View Solution play_arrow
-
question_answer21)
Gene mutation is caused by [CPMT 1973; DPMT 1985; MP PMT 1995; JIPMER 2001]
A)
Reproduction done
clear
B)
Linkage done
clear
C)
Change in the sequence of nitrogenous base done
clear
D)
Change in the sequence of genes in DNA done
clear
View Solution play_arrow
-
question_answer22)
The number of chromosomes in Turner's syndrome is [MP PMT 1990; CBSE PMT 1993]
A)
45 done
clear
B)
43 done
clear
C)
44 done
clear
D)
42 done
clear
View Solution play_arrow
-
question_answer23)
Which of the following disorders is not hereditary [J&K CET 2005]
A)
Haemophilia done
clear
B)
Cataract done
clear
C)
Sickle-cell anaemia done
clear
D)
Colour blindness done
clear
View Solution play_arrow
-
question_answer24)
Disorders of amino acid metabolism results in [CBSE PMT 1993]
A)
Alkaptonuria done
clear
B)
Phenylketonuria done
clear
C)
Albinism done
clear
D)
All the above done
clear
View Solution play_arrow
-
question_answer25)
Genotype of a Down's syndrome is [BHU 1986; AIIMS 1993]
A)
45 + XX done
clear
B)
44 + XY done
clear
C)
44 + XXY done
clear
D)
22 + XY done
clear
View Solution play_arrow
-
question_answer26)
The point mutations A to G, C to T, C to G and T to A in DNA are [JIPMER 1993]
A)
Transition, transition, transversion and transversion respectively done
clear
B)
Transition, transversion, transition and transversion respectively done
clear
C)
Transversion, transversion, transition and transition respectively done
clear
D)
All four are transition done
clear
View Solution play_arrow
-
question_answer27)
Albinism is [CPMT 1977]
A)
Hereditary character done
clear
B)
Non-hereditary character done
clear
C)
Sex-linked character done
clear
D)
Acquired character done
clear
View Solution play_arrow
-
question_answer28)
Turner's syndrome is [BHU 1986; CPMT 1994; MP PMT 1994, 98]
A)
XO done
clear
B)
XX done
clear
C)
XY done
clear
D)
XYY done
clear
View Solution play_arrow
-
question_answer29)
The number of chromosomes in Down's syndrome is [CPMT 1983; CBSE PMT 2005; AFMC 2005; MP PMT 2005]
A)
23rd pair with one less = 45 done
clear
B)
21st pair with one more = 47 done
clear
C)
17th pair with one more = 47 done
clear
D)
One extra sex chromosome = 47 done
clear
View Solution play_arrow
-
question_answer30)
The concept of sudden genetic change which breeds true in an organism is visualised in the principle of [NCERT 1976]
A)
Natural selection done
clear
B)
Heredity done
clear
C)
Variations done
clear
D)
Mutations done
clear
View Solution play_arrow
-
question_answer31)
A man having Klinefelter's syndrome is [J&K CET 2005; MP PMT 2005]
A)
Intersex with secondary sexual characters on the side of female done
clear
B)
Male with secondary sexual characters of female done
clear
C)
Female with secondary sexual characters of male done
clear
D)
Normal fertile male done
clear
View Solution play_arrow
-
question_answer32)
A man homozygous for brown colour marries a lady heterozygous for brown colour is dominant. What will be the fate of their children [BHU 1986]
A)
All brown done
clear
B)
Three brown done
clear
C)
Two brown done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer33)
Edward's syndrome, Patau's syndrome and Down's syndrome are due to [DPMT 1983; MP PMT 1997, 2003; CPMT 1999; Orissa JEE 2005]
A)
Mutation due to malnutrition done
clear
B)
Change in sex chromosomes done
clear
C)
Change in autosomes done
clear
D)
Change in both sex chromosomes and autosomes done
clear
View Solution play_arrow
-
question_answer34)
An albino lady marries a normal man having one gene for albinism. They have 3 daughters and 1 son. The son will be
A)
Normal done
clear
B)
Either normal or albino done
clear
C)
Half normal half albino done
clear
D)
Normal in childhood but turns albino on becoming adult done
clear
View Solution play_arrow
-
question_answer35)
A pleiotropic gene is one which
A)
Affects one character done
clear
B)
Affects more than one characters done
clear
C)
(a) and (b) both done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer36)
Symptoms representing a particular disease due to chromosomal abnormalities are referred to
A)
Sex mosaic done
clear
B)
Syndrome done
clear
C)
Lethal done
clear
D)
Pedigree done
clear
View Solution play_arrow
-
question_answer37)
Mutations occur
A)
Mainly in haploid cells done
clear
B)
Mainly in diploid cells done
clear
C)
Whenever cells are exposed to X-rays done
clear
D)
In any cell of the body exposed to radiation done
clear
View Solution play_arrow
-
question_answer38)
What would be the number of chromosomes in the ovum (fertilized by a normal sperm) that resulted in the appearance of Klinefelter's syndrome in the offspring [MP PMT 1990]
A)
23 done
clear
B)
22 done
clear
C)
21 done
clear
D)
24 done
clear
View Solution play_arrow
-
question_answer39)
Condition of sex chromosomes in a male child of Down's syndrome will be [CBSE PMT 1991]
A)
XY done
clear
B)
XXY done
clear
C)
XX done
clear
D)
XO done
clear
View Solution play_arrow
-
question_answer40)
Trisomic condition of Down's syndrome arises due to [CBSE PMT 1991; MP PMT 2003]
A)
Triploidy done
clear
B)
Translocation done
clear
C)
Non-disjunction done
clear
D)
Dicentric bridge formation done
clear
View Solution play_arrow
-
question_answer41)
An example of a disease of molecular mutation is [MP PMT 1994]
A)
Erythroblastosis fetalis done
clear
B)
Haemophilia done
clear
C)
Anaemia done
clear
D)
Sickle-cell anemia done
clear
View Solution play_arrow
-
question_answer42)
Hugo de Vries formulated the "Mutation Theory" based on the experiments he conducted on [MP PMT 1994]
A)
Althea rosea done
clear
B)
Pisum sativum done
clear
C)
Drosophila melanogaster done
clear
D)
Oenothera lamarckiana done
clear
View Solution play_arrow
-
question_answer43)
A hereditary disease which is never passed on from father to son is [J&K CET 2005]
A)
Autosomal linked disease done
clear
B)
X-chromosomal linked disease done
clear
C)
Y-chromosomal linked disease done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer44)
Continuous variations are attributed to
A)
Chromosomal aberrations done
clear
B)
Polyploidy done
clear
C)
Mutations done
clear
D)
Crossing over done
clear
View Solution play_arrow
-
question_answer45)
In Drosophila, gene for white eye mutation is also responsible for depigmentation of body parts. Thus a gene that controls several phenotypes is called [Kerala CET 2005]
A)
Oncogene done
clear
B)
Epistatic gene done
clear
C)
Hypostatic gene done
clear
D)
Pleiotropic gene done
clear
E)
Sex-linked gene done
clear
View Solution play_arrow
-
question_answer46)
The functional unit of mutation is [JIPMER 1994; MP PMT 1994; AFMC 1995]
A)
Gene done
clear
B)
Muton done
clear
C)
Recon done
clear
D)
Cistron done
clear
View Solution play_arrow
-
question_answer47)
The most striking example of point mutation is found in a disease called [CBSE PMT 1995]
A)
Night blindness done
clear
B)
Thalassemia done
clear
C)
Down's syndrome done
clear
D)
Sickle-cell anaemia done
clear
View Solution play_arrow
-
question_answer48)
An abnormal human male phenotype involving an extra X chromosome (XXY) is a case of [CBSE PMT 1995; CPMT 1996; MP PMT 1997, 2004]
A)
Down's syndrome done
clear
B)
Intersex done
clear
C)
Edward syndrome done
clear
D)
Klinefelter syndrome done
clear
View Solution play_arrow
-
question_answer49)
Which of the following is not related to chromosomal aberration [MP PMT 1995]
A)
Euploidy done
clear
B)
AIDS done
clear
C)
Aneuploidy done
clear
D)
Klinefelter's syndrome done
clear
View Solution play_arrow
-
question_answer50)
Point mutation is a change which involves [MP PMT 1995]
A)
Loss of a gene done
clear
B)
Addition of a gene done
clear
C)
Deletion of a segment of a gene done
clear
D)
Change in a base of a gene done
clear
View Solution play_arrow
-
question_answer51)
The frequency of a mutant gene in a population is expected to increase, if the gene is [CBSE PMT 1994]
A)
Recessive done
clear
B)
Dominant done
clear
C)
Sex linked done
clear
D)
Favourably selected done
clear
View Solution play_arrow
-
question_answer52)
Albinism is a congenital disorder resulting from the lack of the enzyme [CBSE PMT 1994]
A)
Catalase done
clear
B)
Fructokinase done
clear
C)
Tyrosinase done
clear
D)
Xenthine oxidase done
clear
View Solution play_arrow
-
question_answer53)
Sometimes chromosome number increase or decrease due to [AFMC 1996]
A)
Non-disjunction of chromosome done
clear
B)
Genetic repete done
clear
C)
Mutation done
clear
D)
All of these done
clear
View Solution play_arrow
-
question_answer54)
A person who has 47 chromosomes due to an extra X chromosome is affected by [CPMT 1995; CBSE PMT 1996; MP PMT 2003]
A)
Turner's syndrome done
clear
B)
Klinefelter's syndrome done
clear
C)
Super female done
clear
D)
Down's syndrome done
clear
View Solution play_arrow
-
question_answer55)
Mutations are responsible for
A)
Increasing the population rate done
clear
B)
Variations in organisms done
clear
C)
Constancy in organisms done
clear
D)
For beneficial changes in organisms done
clear
View Solution play_arrow
-
question_answer56)
Edward syndrome is on account of....... [MP PMT 1994, 99, 2000, 04]
A)
45 chromosomes instead of 46 done
clear
B)
Presence of three chromosomes on 18th pair of autosome done
clear
C)
Presence of three chromosomes on 21st pair of autosome done
clear
D)
Presence of three pair of sex chromosomes done
clear
View Solution play_arrow
-
question_answer57)
The cause of Turner's syndrome in man is
A)
Incomplete sex linkage done
clear
B)
Sex-linked inheritance done
clear
C)
Autosomal abnormality done
clear
D)
Sex-chromosomal abnormality done
clear
View Solution play_arrow
-
question_answer58)
In man the mutation disease 'Aniridia' (Congenital absence of iris) occurs due to
A)
Recessive mutation done
clear
B)
Dominant mutation done
clear
C)
Lethal mutation done
clear
D)
All the above done
clear
View Solution play_arrow
-
question_answer59)
Phenyketonuria is a genetic disorder of [Kerala CET 2005]
A)
Trisomic condition done
clear
B)
Monosomic condition done
clear
C)
Autosomal dominant gene done
clear
D)
Autosomal recessive gene done
clear
E)
X-linked done
clear
View Solution play_arrow
-
question_answer60)
Height is [CPMT 2005]
A)
Somatogenic variation done
clear
B)
Discontinuous variation done
clear
C)
Continuous variation done
clear
D)
Blastogenic variation done
clear
View Solution play_arrow
-
question_answer61)
Which one of the following is not a mutagen [MP PMT 1995, 97; 2000]
A)
Ethyl methane sulphonate done
clear
B)
Acetic acid done
clear
C)
Nitrous acid done
clear
D)
Ethylene oxide done
clear
View Solution play_arrow
-
question_answer62)
Mutation rates are affected by [MP PMT 1997]
A)
Temperature done
clear
B)
X-rays done
clear
C)
Gamma and beta radiation done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer63)
A mutation is most likely to have a selective advantage in evolution if [CPMT 2005]
A)
It affects dominant genes done
clear
B)
It affects recessive genes done
clear
C)
It affects whole chromosomes done
clear
D)
The environment remains stable done
clear
View Solution play_arrow
-
question_answer64)
In Down's syndrome (Mongolism) each cell has how many chromosomes [MP PMT 1998]
A)
\[{{21}^{st}}\]pair having one less done
clear
B)
\[{{23}^{rd}}\]pair with one less done
clear
C)
45 done
clear
D)
47 done
clear
View Solution play_arrow
-
question_answer65)
Which of the following is not X-linked recessive [AMU 2005]
A)
Haemophilia-A done
clear
B)
Colour blindness done
clear
C)
\[\beta -\]Thalasemia done
clear
D)
G-6 PD deficiency done
clear
View Solution play_arrow
-
question_answer66)
Gynaecomastia is the symptom of [DPMT 2004]
A)
Down syndrome done
clear
B)
SARS done
clear
C)
Turner's syndrome done
clear
D)
Klinefelter's syndrome done
clear
View Solution play_arrow
-
question_answer67)
Which of the following is the main category of mutation [CBSE PMT 1999]
A)
Genetic mutation done
clear
B)
Zygotic mutaion done
clear
C)
Somatic mutaion done
clear
D)
All of these done
clear
View Solution play_arrow
-
question_answer68)
In human beings, multiple genes are involved in the inheritance of [CBSE PMT 1999]
A)
Colourblindness done
clear
B)
Phenylketonuria done
clear
C)
Sickle-cell anaemia done
clear
D)
Skin colour done
clear
View Solution play_arrow
-
question_answer69)
The formation of multivalents at meiosis in diploid organism is due to [CBSE PMT 1998]
A)
Monosomy done
clear
B)
Inversion done
clear
C)
Deletion done
clear
D)
Reciprocal translocation done
clear
View Solution play_arrow
-
question_answer70)
Mental retardation in man, associated with sex chromosomal abnormality is usually due to [CBSE PMT1998]
A)
Reduction in X complement done
clear
B)
Increase in X complement done
clear
C)
Moderate increase in Y complement done
clear
D)
Large increase in Y complement done
clear
View Solution play_arrow
-
question_answer71)
The reason of fault in gene duplication is [RPMT PMT 1999]
A)
Transformation done
clear
B)
Translocation done
clear
C)
Mutation done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer72)
If haploid chromosome number in a cell is 12. The monosomic number will be [MP PMT 1997, 2000]
A)
24 done
clear
B)
21 done
clear
C)
25 done
clear
D)
23 done
clear
View Solution play_arrow
-
question_answer73)
Normally DNA molecule has A-T, G-C pairing. However, these bases can exist in alternative valency status, owing to rearrangements called [BHU 2000]
A)
Point mutation done
clear
B)
Analogue substitution done
clear
C)
Frame-shift mutation done
clear
D)
Tautomerisational mutation done
clear
View Solution play_arrow
-
question_answer74)
Who reported that Down's syndrome is due to extra 21st chromosome [BVP 2000]
A)
J.L. Down (1866) done
clear
B)
Lejeune (1959) done
clear
C)
Kinefelter (1942) done
clear
D)
Huntington (1872) done
clear
View Solution play_arrow
-
question_answer75)
Mutation caused by a mutagen is [BVP 2001]
A)
Natural done
clear
B)
Chemical done
clear
C)
Spontaneous done
clear
D)
Induced done
clear
View Solution play_arrow
-
question_answer76)
Discontinuous variations are [AIIMS 2001]
A)
Mutations done
clear
B)
Acquired characters done
clear
C)
Essential features done
clear
D)
Nonessential features done
clear
View Solution play_arrow
-
question_answer77)
Epicanthus is the symptom of [KCET 2001]
A)
Haploidy done
clear
B)
Heteroploidy done
clear
C)
Turner?s syndrome done
clear
D)
Down?s syndrome done
clear
View Solution play_arrow
-
question_answer78)
Alkaptonuria is caused due to [JIPMER 2002]
A)
Dominant autosomal gene done
clear
B)
Recessive autosomal gene done
clear
C)
X linked recessive gene done
clear
D)
X linked dominant gene done
clear
View Solution play_arrow
-
question_answer79)
A person may have one gene for normal haemoglobin and one gene for sickle cell haemoglobin. This heterozygous condition is called [BHU 2002]
A)
Genome done
clear
B)
Anaemia done
clear
C)
Gene trait done
clear
D)
Sickle cell trait done
clear
View Solution play_arrow
-
question_answer80)
If a diploid cell is treated with colchicine, then it becomes [CBSE PMT 2002]
A)
Tetraploid done
clear
B)
Diploid done
clear
C)
Triploid done
clear
D)
Monoploid done
clear
View Solution play_arrow
-
question_answer81)
Which one of the following mutation partially or fully reverses the harmful effects of previous mutation [MP PMT 2002]
A)
Indirect suppression done
clear
B)
Intergenic mutation done
clear
C)
Intragenic mutation done
clear
D)
Suppressor mutation done
clear
View Solution play_arrow
-
question_answer82)
Polydactyly in man is due to [J & K CET 2002]
A)
Autosomal dominant gene done
clear
B)
Autosomal recessive gene done
clear
C)
Sex-linked dominant gene done
clear
D)
Sex-linked recessive gene done
clear
View Solution play_arrow
-
question_answer83)
The number of chromosomes in Klinefelter?s syndrome is [CPMT 1995; MP PMT 2003; DPMT 2004]
A)
47 (44 + XXY) done
clear
B)
47 (44 + XXX) done
clear
C)
47 (46 + 1 chromosome 21) done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer84)
Philadelphia chromosome is [MH CET 2002]
A)
13th chromosome done
clear
B)
22nd chromosome done
clear
C)
17th chromosome done
clear
D)
21st chromosome done
clear
View Solution play_arrow
-
question_answer85)
Which pair of chromosomes is concerned with Down's syndrome [MP PMT 1992; CBSE PMT 2002; CPMT 2002; BVP 2002; MH-CET 2002; DPMT 2003]
A)
7th done
clear
B)
18th done
clear
C)
21st done
clear
D)
23rd done
clear
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question_answer86)
The condition in which there are more than two complete set of chromosome is called [MP PMT 2003]
A)
Polytene done
clear
B)
Monoploidy done
clear
C)
Polyploidy done
clear
D)
Aneuploidy done
clear
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question_answer87)
Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder [CBSE PMT 2003]
A)
25% done
clear
B)
100% done
clear
C)
75% done
clear
D)
50% done
clear
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question_answer88)
Monosomy and trisomy can be represented as [DPMT 2003]
A)
B)
C)
D)
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question_answer89)
Given below is the representation of a kind of chromosomal mutation What is the kind of mutation represented [AFMC 1997; AIIMS 2004]
A)
Deletion done
clear
B)
Duplication done
clear
C)
Inversion done
clear
D)
Reciprocal translocation done
clear
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question_answer90)
Which is correct about white tiger [Orissa JEE 2004]
A)
White tiger is recessive mutant done
clear
B)
It is part of subspecies of India tiger done
clear
C)
It is a type of albino done
clear
D)
It is a transgenic animal done
clear
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question_answer91)
A recessive mutant is one which [Orissa JEE 2004]
A)
Is not expressed done
clear
B)
Is rarely expressed done
clear
C)
Is expressed only in homozygous and hemixygous state done
clear
D)
Is expresesed only in heterozygous state. done
clear
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question_answer92)
Frequency of Down's syndrome increases when the maternal age is [Orissa JEE 2004]
A)
Above 35 years done
clear
B)
Below 35 years done
clear
C)
During 1st pregnancy done
clear
D)
In mothers of at least 3 children done
clear
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question_answer93)
The amino acid substituted in sickle cell anaemia is [Kerala CET 2004, 05]
A)
Glutamic acid for valine in the alpha chain done
clear
B)
Glutamic acid for valine in the beta chain done
clear
C)
Valine for glutamic acid in the alpha chain done
clear
D)
Valine for glutamic acid in the beta chain done
clear
E)
None of these done
clear
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question_answer94)
Phenylketonuria is a genetic disorder due to a defect in metabolism of the following. [Kerala PMT 2004]
A)
Polysaccharides done
clear
B)
Fatty acids done
clear
C)
Vitamins done
clear
D)
Amino acids done
clear
E)
Hormones done
clear
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question_answer95)
Turner's syndrome is an example of [Kerala PMT 2004]
A)
Monosomy done
clear
B)
Bisomy done
clear
C)
Trisomy done
clear
D)
Polyploidy done
clear
E)
Translocation done
clear
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question_answer96)
In man, which of the following genotypes and phenotypes may be the correct result of aneuploidy in sex chromosomes [CPMT 2004]
A)
22 pairs + XXY males done
clear
B)
22 pairs + XX females done
clear
C)
22 pairs + XXXY females done
clear
D)
22 pairs + Y females done
clear
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question_answer97)
The "cri-du-chat" syndrome is caused by change in chromosome structure involving [AIIMS 2005]
A)
Deletion done
clear
B)
Duplication done
clear
C)
Inversion done
clear
D)
Translocation done
clear
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question_answer98)
Somaclonal variation appears in [AIIMS 2005]
A)
Organism produced through somatic hybridization done
clear
B)
Plants growing in highly polluted conditions done
clear
C)
Apomictic plants done
clear
D)
Tissue culture raised plants done
clear
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question_answer99)
Which one of the following is a dominant trait
A)
Albinism done
clear
B)
Sickle cell anaemia done
clear
C)
Phenylketonuria done
clear
D)
Polydactyly done
clear
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question_answer100)
Turner's syndrome in human is caused by [CPMT 1990]
A)
Autosomal aneuploidy done
clear
B)
Sex chromosome aneuploidy done
clear
C)
Polyploidy done
clear
D)
Point mutation done
clear
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question_answer101)
In order to determine whether variations of a character in a population were genetically controlled, the most appropriate procedure will be to
A)
Count chromosomes and find out the variations in number in the population done
clear
B)
Examine DNA and see if the population shows any variation done
clear
C)
Measure the variations and see if they are continuous or discontinuous done
clear
D)
Cross individuals of both extremes and see if the offsprings and parents show the range of variations done
clear
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question_answer102)
Mutations are
A)
Changes which are not inherited done
clear
B)
Changes which are inherited done
clear
C)
Changes which may or may not be inherited done
clear
D)
Changes acquired by organisms during their life time done
clear
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question_answer103)
Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino [CBSE PMT 1998]
A)
100% done
clear
B)
25% done
clear
C)
50% done
clear
D)
75% done
clear
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