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question_answer1)
In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in \[{{F}_{1}}\] generation is
A)
25% done
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B)
50% done
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C)
75% done
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D)
100%. done
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question_answer2)
Genetic drift is defined as
A)
A random change in gene frequencies occurring by chance fluctuations done
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B)
A change in an allele due to alteration in the DNA molecule done
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C)
A change in gene frequencies due to exchange of genes between different populations done
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D)
A product of natural selection. done
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question_answer3)
Ruby crossed a tall pea plant with white flowers and a dwarf plant with violet flowers. She performed a _______ .
A)
Test cross done
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B)
Dihybrid cross done
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C)
Natural selection done
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D)
Monohybrid cross done
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question_answer4)
Select the correct statement among the following.
A)
Human female possesses homomorphic sex chromosomes. done
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B)
Males are homogametic in humans. done
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C)
Human females are heterogametic in humans. done
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D)
Human male possess homomorphic sex chromosomes. done
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question_answer5)
In which of the following organisms sex determination occurs under the effect of environmental factors?
A)
Chrysemys picta done
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B)
Homo sapiens done
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C)
Drosophila melanogaster done
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D)
Pava cri status done
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question_answer6)
Mendel selected garden peas as his experimental material because
(i) Pea plants possess a number of well defined contrasting characters. |
(ii) Pea plants contain unisexual flowers. |
(iii) Pea plants have perfect bisexual flowers. |
(iv) These are annual plants. |
A)
(i) and (iv) only done
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B)
(i) and (ii) only done
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C)
(i) and (iii) only done
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D)
(i), (iii) and (iv) only done
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question_answer7)
Two species of hen X and Y breed in the month of April and November respectively. They cannot interbreed due to ___.
A)
Temporal isolation done
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B)
Mechanical isolation done
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C)
Physiological isolation done
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D)
Behavioural isolation done
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question_answer8)
Refer to the given figure. It shows wings of two animals X and Y. These wings are Z structures.
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Select the option that correctly identifies X, Y and Z.
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A)
B)
C)
D)
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question_answer9)
Farmers have produced (or evolved) entirely different looking vegetables from wild cabbage. Below are given some evolved types along with their characteristics. Select the incorrect match among them.
A)
Flower clusters - Cauliflower done
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B)
Fleshy stem - Kohlrabi done
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C)
Fleshy lateral buds - Brussel's sprouts done
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D)
Fleshy terminal buds - Kohlrabi done
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question_answer10)
A group of population splitting into two populations due to some factor, can be called two independent species only when
A)
They can interbreed with each other done
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B)
They cannot interbreed with each other done
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C)
They are not geographically isolated done
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D)
None of these. done
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question_answer11)
The genotype for the height of an organism is Tt. What conclusion may be drawn from this?
A)
The allele for height has at least two different genes. done
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B)
There are at least two different alleles for the gene for height. done
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C)
There are two different genes for height, each having a single allele. done
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D)
There is one allele for height with two different forms. done
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question_answer12)
Pure breeding pea plants with green pods are crossed with pure breeding pea plants with yellow pods. All the \[{{F}_{1}}\] generation plants have green pods. Plants from the \[{{F}_{1}}\] generation are allowed to be interbred. What colour of pods will be observed in \[{{F}_{2}}\] generation plants?
A)
All green done
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B)
All yellow done
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C)
1 green : 1 yellow done
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D)
3 green : 1 yellow done
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question_answer13)
In mice, the allele for black fur colour is dominant over the allele for white fur colour. What does this mean in a mouse population?
A)
Mice with black fur are more successful breeders. done
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B)
Most mice have black fur. done
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C)
When a black-furred mouse breeds with a white-furred one, the offspring will have grey fur. done
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D)
White-furred mice are only born to two white-furred parents. done
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question_answer14)
The given figure shows undisturbed sedimentary strata at the bottom of an ocean. The fossil found in layer Vresembles the fossil found in layer X. This similarity most likely suggests that
A)
The fossil of layer X must be more complex than that of layer Y done
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B)
Modern forms of life may have evolved from earlier forms of life done
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C)
The fossil of layer Y was formed before the fossil of layer X done
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D)
Vertebrate fossils are found only in sediments. done
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question_answer15)
Albinism is an inherited condition caused by a recessive alleie 'a'. 'A' is the dominant allele for the normal condition. Study the given pedigree chart and identify the genotypes of individuals R and S.
A)
B)
C)
D)
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question_answer16)
Humans inherit colour of their eyes from their parents. Brown-eyed couple has three blue-eyed children. Which of the following statements gives correct explanation of this situation?
(i) Each parent has an allele for brown eyes and an allele for blue eyes. |
(ii) The allele for blue eyes is recessive. |
(iii) The probability that their next child will have blue eyes is 0.75. |
(iv) The probability that their next child will have brown eyes is 0.5. |
A)
(i) and (ii) only done
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B)
(i) and (iii) only done
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C)
(ii) and (iv) only done
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D)
(iii) and (iv) only done
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question_answer17)
For evolution to occur in a population, which of the following must happen?
A)
The frequencies of some alleles in an organism's genotypes must change during its lifetime. done
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B)
The frequencies of each allele in an organism's genotype must remain constant within its lifetime. done
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C)
The frequencies of some alleles in a population's gene pool must change over successive generations. done
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D)
The frequencies of each allele in a population's gene pool must remain constant over successive generations. done
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question_answer18)
Direction: Read the given passage and answer the following questions. Siddhi studied forelimbs of three organisms and described them as follows:
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Organism X - Long and short bones, covered with muscles, used for running.
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Organism Y - Long and short bones, covered with feathers used for flying.
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Organism Z - A layer of a complex chemical with supporting framework which is not made of bones and used for flying.
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Select the option that shows correct relationship between these organisms.
A)
B)
C)
D)
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question_answer19)
Direction: Read the given passage and answer the following questions. Siddhi studied forelimbs of three organisms and described them as follows:
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Organism X - Long and short bones, covered with muscles, used for running.
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Organism Y - Long and short bones, covered with feathers used for flying.
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Organism Z - A layer of a complex chemical with supporting framework which is not made of bones and used for flying.
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Forelimbs of organisms X and Y are _______ organs while forelimbs of organisms Y and Z are _______ organs.
A)
Analogous, Vestigial done
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B)
Homologous, Vestigial done
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C)
Analogous, Homologous done
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D)
Homologous, Analogous done
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question_answer20)
Given pedigree chart depicts the inheritance of attached ear-lobes, an autosomal recessive trait.
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Which of the following conclusions drawn is correct?
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A)
Parents are heterozygous dominant. done
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B)
Parents are homozygous dominant. done
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C)
Parents are homozygous recessive. done
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D)
None of these. done
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