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BIOLOGY

JAMB 2010 - Question 48

Biology 2010 JAMB Past Questions - Question 48: At what stage in the life history of a mammal is the sex of an individual set?

Choose the most appropriate option for the gap .

At what stage in the life history of a mammal is the sex of an individual set?

A: At puberty

B: At birth.

C: At conception

D: At adolescence

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Correct Answer

Explanation

The sex of an individual is determined at conception. The male sex cell called spermatozoon contains either X or Y chromosome. If sperm with X- chromosomes fertilizes the egg (always with X. chromosome) a baby girl results. If the sperm with Y chromosome fertilizes the egg a baby boy results. thus the man determines the sex of the baby at conception.