Genetic identity of a human male is determined by

Describe haploid diploid sex determination system ?
 

A male child would be born to parents if

$(a)$ In humans, males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic ?

$(b)$ Also describe as to who determines the sex of an unborn child ? Mention whether temperature has a role in sex determination.

In melandrium the sex determination type is

Which one of the following conditions correctly describes the manner of determining the sex?