Homework Answers
The correct option is d. In banthas, individuals that are homozygous recessive for gene aa are albino. Banthas of the A_ genotype can have either gray (bb) or brown fur (B_).
In epistasis, the interaction between two genes is antagonistic. One gene supresses the expression of the other gene.
In the above example, the presence of mutant aa genotype mask the effect of B and b allele so only albino phenotype is seen.
But in case of AA/Aa genotype, the effect of B and b allele can be observed as brown or gray phenotype.
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