Question

1.why three pair of genes control the skin colour of men?

2.difference between multiple gens and multiple alleles
3.we are known that an orgnism xannot have more then one alleles of a genes but in the case of human skin colour in men their are 3 pair of gen control the skin colour of men?how.
4.polygenic inheritance
5.multiple gene
6 alleles
7.genes
9.loci
10.eyes colour in drosophila
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Answer 1

Explanation:

Human skin color is a polygenic trait, which is controlled by a number of genes. According to the question, there are just three gene pairs on different chromosomes and that for each pair there are two alleles - an incompletely dominant one that codes for melanin deposition and an incompletely recessive one that codes for no melanin deposition. 

Let the dominant allele for the three genes controlling the skin color be represented as M, N and O and their respective recessive forms can be represented as m, n and o.

Since, these alleles exhibit incomplete dominance, a very dark skinned man should have all the alleles in dominant form and must have the genotype MMNNOO. Similarly, a very light skinned woman should have all the alleles in recessive form mmnnoo.