Question

The color of seeds for plant Z is determined by two alleles. Plant Z's genotype for red seeds is RR. Plant Y's genotype for blue seeds is BB. Their offspring's genotype is RB and the phenotype is purple seeds. This pattern of inheritance is called __________.

Answer 1

Incomplete dominance

Step-by-step explanation:

Incomplete dominance is an inheritance pattern in which one allele of a gene does not completely mask the expression of its contrasting pair, hence, both alleles combine to form a third intermediate phenotype, which is a blending of both parental phenotypes.

This is the case in Plant Z with a gene coding for seed colour. The allele for red seed (R) is incompletely dominant over the allele for blue seed (B). Hence, both alleles form an intermediate hybrid with genotype, RB, which appears as purple seeds. The purple color is a blending of both red and blue phenotype. This inheritance pattern is said to be INCOMPLETE DOMINANCE because red seed color is incompletely dominant over blue seed color.