Question

Consider three genes $\frac{A}{a},\frac{B}{b}and\frac{C}{c}$ responsible for skin color inheritance. Then the phenotypes of persons with genotypes AABBCC and aabbcc respectively would be

• A. Very dark and moderate dark
• B. Very dark and very fair
• C. Very fair and very dark
• D. Moderate dark and moderate fair

Answer 1

The correct option is B

Very dark and very fair

Considering $\frac{A}{a},\frac{B}{b}and\frac{C}{c}$ as the three genes responsible for skin color inheritance, the dominant alleles A, B and C represent greater melanin production and the recessive alleles a, b and c represent less melanin production. Thus, a person with the genotype AABBCC would be very dark, while a person with the genotype aabbcc would be very fair.