Dominant epistasis ratio is

9 : 7

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9 : 3 : 3 : 1

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9 : 3 : 4

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12 : 3 : 1

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9 : 6 : 1

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Solution

The correct option is E 12 : 3 : 1

A.9:7 – Complementary genes

B.9:3:3:1 – Dihybrid phenotypic ratio

C.9:3:4 – Recessive epistatis ratio

D.12:3:1 – Dominant epistasis ratio

E.9:6:1 – Polymeric gene interaction ratio
So, the correct option is ’12:3:1’.

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When dominant epistasis is operative between two genes loci, the classical 9:3:3:1 ratio becomes modified into

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