Heritage Valley Farm's veterinary genetics consultant works with complex inheritance patterns that go beyond simple dominance, and also provides genetic counseling services for human families. These advanced patterns require understanding codominance, incomplete dominance, multiple alleles, and polygenic traits.
Question 7 (11.111111111 points)
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A genetic counselor explains ABO blood type inheritance to a family. The ABO system has three alleles (IA, IB, i) where IA and IB are codominant to each other but both are dominant to i. How many different phenotypes are possible in the ABO blood system?
Question 7 options:
Three phenotypes: A, B, and O blood types only
Six phenotypes: one for each possible genotype combination
Four phenotypes: A, B, AB, and O blood types
Two phenotypes: dominant and recessive blood types only
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Four phenotypes: A, B, AB, and O blood types.
Explanation: The three alleles (IA, IB, i) produce six genotypes (IAIA, IAi, IBIB, IBi, IAIB, ii), but these correspond to four phenotypes because IA and IB are codominant (giving AB), each is dominant over i (giving A or B), and ii gives O.
Explanation: The three alleles (IA, IB, i) produce six genotypes (IAIA, IAi, IBIB, IBi, IAIB, ii), but these correspond to four phenotypes because IA and IB are codominant (giving AB), each is dominant over i (giving A or B), and ii gives O.
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