Question

Epistasis in which dihybrid ratio of 9 : 3 : 3 : 1 between Aa Bb $\times$ AaBb is modified is

• A. Dominance of one allele on another allele at the same locus
• B. Dominance of one allele on another allele at both its loci
• C. Interaction of two alleles at different loci
• D. Interaction between two alleles at same locus

Answer 1

The correct option is B Dominance of one allele on another allele at both its loci

A gene which masks the action of another gene is termed as epistasis. The gene is called epistatic gene and the gene whose effect is masked is termed as hypostatic gene. So, in epistasis, two genes are present in different loci, and one gene is epistatic to another gene.

So, the correct option is ‘Dominance of one allele on another allele at both its loci’.