$I.Q.$ is the ratio of mental age to
Chronological age multiplied by ten
Chronological age plus ten
Chronological age plus $100$
Chronological age multiplied by $100$
Crossing over that results in genetic recombination in higher organisms occurs between
The expression of genes for the production of milk in only females is a
Discontinuous variations are
The given diagram $A$ and $B$ indicates
If a diploid cell is treated with colchicine, then it becomes