$........$ is the unit of heredity.

$A$ trait may be inherited, but may not be expressed. Justify this statement with the help of a suitable example.

The differences observed among individuals are known as...

In the following crosses,write the characteristics of the progeny:

Cross	Progeny
$(a)$ $RR YY \times RR YY$ (Round,yellow $\times$ Round,yellow)	..........
$(b)$ $Rr Yy \times Rr Yy$ (Round,yellow $\times$ Round,yellow)	..........
$(c)$ $rr yy \times rr yy$ (Wrinkled,green $\times$ Wrinkled,green)	..........
$(d)$ $RR YY \times rr yy$ (Round,yellow $\times$ Wrinkled,green)	..........

Farmers generated different vegetables from wild cabbage by artificial selection. Name the vegetables obtained for the following desired traits:
$(i)$ Arrested flower development
$(ii)$ Sterile flowers
$(iii)$ Very short distances between leaves
$(iv)$ Swollen parts
$(v)$ Broader leaves

The maleness of a child is determined by