Following expression is incorrect a. bb EE gives yellow.
Recessive epistasis is when the recessive allele of one gene masks the expression of all alleles of another gene present in the gene pool. so, Recessive epistasis is when the recessive allele masks the expression of other gene.
According to the law of recessive epistasis, at least one dominant allele is required at the E locus for expression at the b locus. As in option bb EE gives yellow the E locus which is dominant Hence, b locus is results in expression to give chocolate or brown color and not yellow color.
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