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In a cross between red kernelled and whi...

In a cross between red kernelled and white kernelled varieties of wheat showing polygenic inheritance, the phenotypic ratio in `F_(2)` generation will be ……. .

A

`1 : 2 : 1 `

B

`1 : 4 : 6 : 4 : 1 `

C

1 : 6 : 15 20 : 15 : 6 : 1

D

9 : 3 : 3 : 1

Text Solution

Verified by Experts

The correct Answer is:
B
The polygenic inheritance phenotypic ratio is calculated by finding no. of possible genotype formed in cross. No. of genotypes for dihybrid cross = `2^(2xx 2)` = `2^4 = 16`
1: 4: 6: 4:1 = 16
No. of Possible genotypes for trihybrid cross
`= 2^(2xx 3) = 2^6 = 64`
1 : 6 : 15 : 20 : 15 : 6 : 1 = 64.
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