Chickens will produce a “walnut comb” on their head only if they possess at least one dominant allele in each of two different genes.

Question

epistasis
environmental effects
pleiotropy

Answer 1

Epistasis is the phenomenon where the effect of one gene is dependent on the presence of one or more other genes.

Environmental effects refer to the impact of external factors such as diet, temperature, and stress on the expression of genes.

Pleiotropy is when one gene affects multiple traits or phenotypes.