In $F_{2}$-generation,quantitative inheritance $1: 4: 6: 4: 1$ is obtained instead of

Polygenic inheritance in humans is represented by ....

Choose the possible genotype responsible for lightest skin colour in human beings.

The inheritance of skin color in humans is an example of which of the following?

$A$ polygenic trait is controlled by $3$ genes $A, B$,and $C$. In a cross $AaBbCc \times AaBbCc$,the phenotypic ratio of the offspring is observed as $1:6:x:20:x:6:1$. What is the possible value of $x$?

In tomatoes,a plant with the genotype $aabbcc$ produces $100 \,g$ tomatoes,and a plant with the genotype $AABBCC$ produces $160 \,g$ tomatoes. What is the contribution of each polygene to the tomato weight (in $,g$)?