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A polygenic trait is controlled by 3 g...

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
`1:6:x:20:x:6:1`
What is the possible value of x ?

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The correct Answer is:
D
`F_(b)=(2rhogh+rhogh)a^(2)=3rhogha^(2),F_(w)=[(rhogh)/(2)]ah+(2rhogh)ah=(5)/(2)rhogha^(2)` [here `h=a`], `(F_(b))/(F_(w))=(3)/(5//2)=((6)/(5))`
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