In a dihybrid cross,the F_2 generation ratio | vedclass

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Question

(C) In a dihybrid cross,the standard Mendelian ratio is $9:3:3:1$. When two different genes control the same trait and the presence of at least one do

Vedclass · Accepted Answer

Duplicate genes

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(C) In a dihybrid cross,the standard Mendelian ratio is $9:3:3:1$. When two different genes control the same trait and the presence of at least one dominant allele of either gene produces the same phenotype,it is known as duplicate genes. In this case,the phenotypic ratio becomes $9+3+3:1$,which equals $15:1$. Therefore,the $15:1$ ratio in the $F_2$ generation is the result of duplicate genes.

In a dihybrid cross,the $F_2$ generation ratio of $15:1$ is the result of:

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