Question

In humans, an egg involved in male child formation has the genetic constitution of ____.

• A. 22 + X
• B. 22 + Y
• C. 44 + XY
• D. 44 + XX

Answer 1

The correct option is A 22 + X

Human follows XX- XY mechanism of sex determination. Human females have 46 chromosomes arranged in 22 autosomes and two copies of X chromosomes as sex chromosomes (44+XX). Males have 22 autosomes and the XY pair (44+XY) as sex chromosomes. All the gametes produced by females contain only the X chromosome (22 + X), whereas males produce two kinds of gametes, 1/2 gametes with X- and 1/2 with Y-chromosome (22 + X and 22 + Y). Fertilization of egg (22 + X) with sperm carrying 22+X chromosomes results in female child (44 + XX). Fertilization of egg (22 + X) with the sperm carrying 22+Y chromosomes results in a male child (44A + XY) as the zygote consists of two complete sets of chromosomes.

Thus, the correct answer is option A.