The dominance pattern of a gene can be determined from the phenotypes of the parents and offspring. In the examples below, assume that each parent is homozygous for the specific allele and that the progeny are heterozygous. Classify each example as either complete dominance, incomplete dominance, or codominance.

a. A pea plant with all purple flowers and a pea plant with all white flowers produce a pea plant with all purple flowers.

b. A mother with type A blood and a father with type B blood have a daughter with type AB blood.

c. A red snapdragon and a white snapdragon produce a pink snapdragon.

d. A green fish and a yellow fish have mottled green and yellow offspring.

e. A mother with straight hair and a father with curly hair have a son with wavy hair.

A-complete dominant

B-codominance

C-Incomplete dominant

D-codominance

E-Incomplete dominance

Explanation:

Complete dominance - This is when a dominant Allen completely mask the effect of a recessive allele and the offspring express its phenotype E. g. A pea plant with all purple flowers and a pea plant with all white flowers produce a pea plant with all purple flowers.

Incomplete dominance - This occur when the dominant allele doesn't fully dominate over the recessive allele and the offspring shows a combination of both allele (a phenotype different from the parent)

E. g A red snapdragon and a white snapdragon produce a pink snapdragon.

Codominance - This occur when both allele express itself. The phenotype of the offspring consists of both allele example AB blood group