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A polygenic trait is controlled by 3 gene A, B and C. In a cress AaBbCc × AaBbCc, the phenotypic ratio of the offspring's was observed as 1 : 6 : × 20 X : 6 : 1 - what is the possible value of X? -

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Question

A polygenic trait is controlled by 3 gene A, B and C. In a cress AaBbCc × AaBbCc, the phenotypic ratio of the offspring's was observed as 1 : 6 : × 20 X : 6 : 1 - what is the possible value of X?

Options

  • 3

  • 9

  • 15

  • 25

MCQ

Solution

15

Explanation:

No. of individuals in F2 = 4n

N = Number of genes present = 43 = 64 indivivduals

1 + 6 + 2x + 20 + 6 + 1 = 64

2x = 64 − 34x = `30/2` = 15

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