Question

The sperm of a man contains 22 autosomes and

• A. Only one X chromosome
• B. Both X and Y chromosome
• C. Either X or Y chromosome
• D. Only one Y chromosome

Answer 1

The correct option is C Either X or Y chromosome

Human follows XX- XY mechanism of sex determination. Human females have forty-six chromosomes arranged in twenty-two homologous and homomorphic autosomes and two copies of X chromosomes as sex chromosomes (44+XX). Males have twenty-two 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). The hemizygous males produce two kinds of gametes, 1/2 gametes with X- and 1/2 with Y-chromosome (22 + X and 22 + Y). Sperm is a haploid structure that carries single chromosome member from each homologous pair. Thus, both X and Y chromosomes cannot be present together in a sperm. Thus, the correct answer is option C.