Phenotypic ratio in $F_{2}$ in a cross showing dominant epistasis is _______.

12 : 3 : 1

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9 : 6 : 1

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15 : 1

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9 : 3 : 4

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Solution

The correct option is C 15 : 1
When a dominant allele masks the expressoion of both dominant and recessive alleles of another gene, the pattern of inheritance obtained is called dominant epistasis. Awn character in rice shows Dominant epistasis.

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In a genetic cross having recessive epistasis, F₂ phenotypic ratio would be

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