If skin colour in humans is controlled by three gene pairs, then what is the number of intermediates and parental combinations in F2 generation?

Question

If skin colour in humans is controlled by three gene pairs, then what is the number of intermediates and parental combinations in F2 generation? (A) 2,62 (B) 62,2 (C) 2,14 (D) 14,2

Tardigrade Admin · Accepted Answer

Polygenic inheritance is a quantitative inheritance which is controlled by two or more genes and dominant alleles of each have a cumulative effect on the character. The full trait is shown only when all the dominant alleles are present.

Human skin colour is an example of polygenic character. It has a pigment called melanin and the quantity of this pigment is determined by three pairs of polygenes (A, B & C). Cross: Very light (aabbcc) X Very dark (AABBCC) F1 genotype = AaBbCc F1 phenotype = Mulatto or Intermediate F2 genotype = 1:6:15:20:15:6:1 F2 phenotypes = Very dark: Dark: fairly dark: intermediate: Fairly light: Light: white The number of intermediates and parental combinations in F2 generation are 62 and 2.

Q. If skin colour in humans is controlled by three gene pairs, then what is the number of intermediates and parental combinations in $F_{2}$ generation?

$2, 62$

$62, 2$

$2, 14$

$14, 2$

Q. If skin colour in humans is controlled by three gene pairs, then what is the number of intermediates and parental combinations in F2​ generation?

2,62

62,2

2,14

14,2

Q. If skin colour in humans is controlled by three gene pairs, then what is the number of intermediates and parental combinations in $F_{2}$ generation?

$2, 62$

$62, 2$

$2, 14$

$14, 2$