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A polygenic trait is controlled by 3 gen...

A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc `xx` AaBbCc, the phenotypic ratio of the offsprings was observed as :
`1:6xx:20xx:6:1` what is the possibe value of x?

A

3

B

9

C

15

D

25

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The correct Answer is:
C
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