The average ratio of male to female individuals based on $XX$ and $XY$ type of sex determination, in total world of human population is
$3:1$
$1:3$
$1:4$
$1:1$
Sexual reproducation leads to
The given diagram $A$ and $B$ indicates
$A$ : Antlers in male deer are sex influenced traits.
$R$ : These are controlled by autosomal genes which are influenced by the sex of bearer
Inheritance of skin colour in human is an example of
Which one of the following mutation partially or fully reverses the harmful effects of previous mutation