Textbook Question
A man with type B blood and a woman who has type A blood could have children of which of the following phenotypes?
a. A or B only
b. AB only
c. AB or O
d. A, B, AB, or O
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13. Mendelian Genetics
Incomplete Dominance vs. Codominance
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How many different phenotypes can be produced by a pair of codominant alleles?
A
Three
B
Four
C
Two
D
One
Verified step by step guidance1
Understand the concept of codominance: Codominance occurs when two different alleles for a gene are both expressed equally in the phenotype of an organism. This means that neither allele is dominant or recessive, and both contribute to the organism's traits.
Identify the possible genotypes: With a pair of codominant alleles, there are typically three possible genotypes: homozygous for the first allele, homozygous for the second allele, and heterozygous (one of each allele).
Determine the phenotypes for each genotype: In codominance, each genotype results in a distinct phenotype. The homozygous genotypes will each express their respective allele's trait, while the heterozygous genotype will express a combination of both alleles' traits.
Count the distinct phenotypes: Since each genotype results in a unique phenotype, count the number of different phenotypes that can be produced. Typically, this will be three: one for each homozygous genotype and one for the heterozygous genotype.
Review examples of codominance: To solidify understanding, consider examples such as blood type in humans, where the A and B alleles are codominant, resulting in phenotypes A, B, and AB.
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