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Question

Sickle cell anemia is a recessive genetic blood disorder. The allele for sickle red blood cells is codominant to the normal allele. Cross a carrier male with a carrier female. List the genotype and phenotype ratios. Hint: codominant means they both show up.

Answer 1

Carrier male=Ss

Carrier female=Ss

Crossing using a Punnet Square: 25% would be homozygous dominant (no sickle cell), 50% would be carriers (codominant), and 25% homozygous recessive ( full sickle cell)

Genotypes: 1 offspring SS, 2 offspring Ss, and 1 offspring ss

Phenotypes: 1 offspring no sickle cell, 2 offspring are carriers (codominant), and 1 offspring has full sickle cell