Match following pair.
Sex determination in Drosophila melanogaster is based on
There are five daughters and no son in a family. It may be due to
What type of sex determination is observed in grass hopper ?
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.