Question

The sperm of a man contains 22 autosomes and
A only one X chromosome
B only one Y chromosome
C either X or Y chromosome
D both X and Y chromosome

Answer 1

Hint:- mechanism of sex determination tells Males have 22 homomorphic pairs and one heteromorphic pair (XY pair) .at the time of cell division meiosis gametes produced by females contain only the X chromosome (22 + X).both X and Y cannot be present in a sperm at a time.

Complete step-by-step solution:-
We follows XX- XY mechanism of sex determination.Males have 22 homomorphic pairs and one heteromorphic pair, the XY pair (44+XY). During meiosis, all the gametes produced by females contain only the X chromosome (22 + X) and females have forty-six chromosomes arranged in twenty-two homologous and homomorphic autosomes and two X chromosomes as sex chromosomes (44+XX).
Two kinds of gametes produced by hemizygous males . 1/2 with Y-chromosome and 1/2 gametes with X- (22 + X and 22 + Y). As we know, the human Sperm is a haploid structure which carries a single chromosome member from each homologous pair. Hence , X and Y chromosomes cannot be present together in a sperm.
So ,the correct answer is option C.

Note:- The presence of a Y chromosome determines sex. Normally, cells from males contain an X and a Y chromosome and cells from females contain two X chromosomes, and. sometime, individuals are born with sex chromosome aneuploidies, and the sex of these individuals is always determined by the absence or presence of a Y chromosome. So , individuals with 47,XXY and 47,XYY are known as karyotypes are males, while individuals with 45,X and 47,XXX are known as karyotypes are females.