Explain the mechanism of sex-determination in humans.
b) Differentiate between male heterogamety and female heterogamety with the help of an example of each.

Explanation

a) N//A
b) Male Heterogamety:
i) It is the phenomenon in which the male produces two types of sperms, with reference to the sex-chromosomes.
ii) The sex of the offspring is determined by the type of sperm fertilising the ovum.
Female heterogamety:
i) It is the phenomenon in which the female produces two types of ova, with reference to the sex-chromosomes.
ii) The sex of the offspring is determined by the type of ovum that is fertilised.