Two different types of gametes in terms of the sex chromosomes, are produced by
Female fruit fly
Male butterfly
Male human and female Drosophila
Female birds
Assertion : In humans, the gamete contributed by the male determines whether the child produced will be male or female.
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X-$ chromosome and some on $Y-$ chromosome.
Sex determination in Drosophila melanogaster is based on
A male child would be born to parents if
Male child will be born if
Sex of a human child is determined by