Question

What is epistasis? Explain dominant epistasis with example.

Answer 1

where one gene controls the phenotype of another gene for a trait. Both genes have an influence on the physical appearance of the trait, but the one that shows epistasis masks the effect of the other is called epistasis...

Dominant epistasis happens when the dominant allele of one gene masks the expression of all alleles of another gene

Answer 2

Answer:

Dominant Epistasis – It is a gene interaction in which two alleles of a gene at one locus interfere and suppress or mask the phenotypic expression of a different pair of alleles of another gene at another locus. The gene that suppresses or masks the phenotypic expression of a gene at another locus is known as epistatic.

The gene whose expression is interfered by non-allelic genes and prevents from exhibiting its character is known as hypostatic. When both the genes are present together, the phenotype is determined by the epistatic gene and not by the hypostatic gene.

In the summer squash the fruit colour locus has a dominant allele ‘W’ for white colour and a recessive allele ‘w’ for coloured fruit. ‘W’ allele is dominant that masks the expression of any colour.