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In a polygenic cross Aa Bb Cc xx Aa Bb C...

In a polygenic cross Aa Bb Cc `xx` Aa Bb Cc, the phenotypic ratio of offspring is 1:6:'X':20:X:6:1 . What is the value of 'X'

A

3

B

9

C

15

D

25

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The correct Answer is:
C
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