A) 45 autosomes and X sex chromosome
B) 44 autosomes and XYY sex chromosomes
C) 45 autosomes and XYY sex chromosomes
D) 44 autosomes and X sex chromosome
Correct Answer: D
Solution :
[d] Turner's syndrome is caused by the absence of X-chromosomes in females. Persons suffering from turner's syndrome are monosomic for sex chromosomes i.e., possess only one X and no Y-chromosome (XO). In other words, they have chromosome number In ? 1 =45. They are phenotypic females but are sterile because they have under developed reproductive organs. They are dwarf about 4 feet 10 inches and are flat chested with wide spread nipples of mammary glands which never enlarge like those in normal woman. They develop as normal female in childhood but at adolescence their ovaries remain underdeveloped. They lack female hormone oestrogen. About one out of every 5,000 female births results in Turner's syndrome.
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