Sex determination in Drosophila melanogaster is based on
$X-Y$ chromosome mechanism
Genetic balance between the $X$-chromosome and autosomes
Chromosome -environment interaction
Pseudoalleles.
The sex chromosomes in females are
Select the incorrect pair
A man receives his $X$ chromosomes from
In man, the composition of female destined zygote is
$A$ : $XO$ type sex determination is found in large number of insects.
$R$ : Some of the sperms bear the $X-$chromosome whereas some do not