Question

U Q. 10. 'It is a matter of chance whether a couple will
give birth to a male child or a female child."
Justify this statement with the help of a flow
chart showing the fusion of sex chromosomes.
[Board Term II, Outside Delhi Set II, 2014
OR
How sex is determined in human beings ?​

Answer 1

Answer:

Since the sperm carrying 'X' chromosome and sperms carrying 'Y' chromosome have equal/ 50—50 chance of fertilizing an egg, thus it is a matter of chance whether a couple will give birth to a male or a female child.