8. The dominance pattern of a gene can be determined from the phenotypes of the

Question

8. 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.

Complete dominance: ___________________________________________________________________

Incomplete dominance: _____________________________________________________________________________

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.

Explanation / Answer

Dominance is the mode of inheritance in whic one allele completely prevents phenotypic expression of the other. Incomplete dominance is the mode of inheritance in which none of the alleles is dominant or recessive but an intermediate form of phenotypic pattern is observed. Codominance involves dominance of both alleles at same time.

Thus, the answers can be found as below:

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