Question:
The belief that the mother is completely responsible for the sex of the child is wrong because the child
(a) gets sex chromosome only from the mother
(b) develops in the body of the mother
(c) gets one sex chromosome from the mother and the other from the father
(d) gets sex chromosome only from the father
Solution:
(c) The child gets one sex chrbmosome from the mother and one from the father. The mother has XX combination and always contributes an X-
chromosome.
It is the sperm of father which determines the sex of the child. This is because half of the sperms have X-chromosome and ofher half have Y-
chromosome.