What is the reason for the appearance of waln | vedclass

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(D) In chickens,the inheritance of comb shape is a classic example of gene interaction known as collaborative gene action. When a bird with a rose-com

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Collaborative genes

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(D) In chickens,the inheritance of comb shape is a classic example of gene interaction known as collaborative gene action. When a bird with a rose-comb $(RRpp)$ is crossed with a bird with a pea-comb $(rrPP)$,the $F_1$ generation produces offspring with a walnut-comb $(RrPp)$. This occurs because the two dominant alleles ($R$ and $P$) interact to produce a new phenotype (walnut-comb) that is different from either parent. This phenomenon,where two non-allelic genes interact to produce a new trait,is termed as collaborative gene interaction.

What is the reason for the appearance of walnut-comb in the offspring resulting from a cross between pea-comb and rose-comb in chickens?

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