Q1. The sex of the offspring is determined, when
(a) The conception takes place
(b) The sperm fertilises the ovum
(c) The embryo is partially developed
(d) The end of gestation period is near
(UPSC Prelims 1981)
Answer: (a) The conception takes place
Explanation: The sex of the offspring is determined at the moment of conception, when the sperm fertilises the ovum. The chromosome carried by the sperm (X or Y) decides whether the child will be female (XX) or male (XY).
