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Question

The genotype of human skin colour is AAbbcc and AaBbcc respectively. What is the phenotype of these genotype?

A
Light brown and dark brown
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B
Both are mullato
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C
Both are light brown
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D
Very light brown and very dark brown
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Solution

The correct option is C Both are light brown
Human skin color is a polygenic trait, meaning it is influenced by tow or more alleles as well as the environmental conditions. It is mainly dependent on alleles A/a, B/b, and C/c (dominant/recessive). Here, the dominant alleles contribute towards lighter skin tones and the recessive ones for a darker skin tone. So, an individual with a genotype AAbbcc and AaBbcc would both have light brown phenotypes.
So, the correct answer is 'Both are light brown'.

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