Question

Explain the effect of an inactive alleles in the phenotype according to the polygenic model of inheritance ?

Answer 1

In a polygenic inheritance model, a phenotypic trait is controlled by many independently assorting loci. Each gene loci has an active allele or inactive allele. Active alleles are not dominant to the other active alleles in different loci and their contribution to the increment of a phenotype is small and equal to the other active alleles. Inactive alleles of the gene loci do not contribute to the increment of the phenotype and do not produce a functional gene product.