Question

Which of the following statements is false? Epistasis involves interactions among different genes, to influence phenotype. When an allele is dominant, the heterozygous combination is the same phenotypically as one of the homozygotes. Dominance refers to the form of expression of a gene in relation to its allele (or alleles). Epistasis involves interactions between alleles of a single gene.

Answer 1

Answer)

1. True: epistasis is an interaction between two genes. The tree meaning of epistasis is one above the other. One gene in the genome produces one protein that might affect the function of another protein.

A standard definition of epistasis: The interaction of genes that are not alleles, in particular the suppression of the effect of one such gene by another.

2. True   If an allele is dominant it produces the same effect as the homozygous one.

What does it mean :

if BB genotype produce blue tail feathers in birds

Bb also produces blue tail feathers.

3. True dominance refers to the expression of the dominant allele that masks the recessive form of the allele of the same gene.

In the above example of feathers B allele masks the effects of b allele. Due to many reasons, one might be that the product formed by the B allele is more efficient than protein from b allele.

4.Flase epistasis is an interaction between two different genes not within a gene. Within a gene, it is dominance and recessiveness that masks each other.

Therefor 4th option is the right answer.