The inheritance of human skin color is an example of ........

What are polygenes? Explain polygenic inheritance with the example of human skin color.

Which of the following traits is controlled by more than one gene?

In a polygenic trait,an individual with three recessive alleles expresses $50 \%$ of the trait,while an individual with three dominant alleles expresses $80 \%$ of the trait. What is the contribution of each dominant allele to the trait (in $\%$)?

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 $,g$)?

The phenotype of one parent for skin colour is $AABBCC$ and the other parent is $aabbcc$. What will be the skin colour and genotype for their progeny?