Multiple Choice
In the context of variations of dominance, which term describes an allele that is phenotypically expressed only when present in the homozygous state?
3. Extensions to Mendelian Inheritance
Variations of Dominance
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In the context of variations of dominance, the human ABO blood group system is best described as which type of inheritance?
A
Polygenic inheritance controlled by many genes with additive effects
B
Simple complete dominance with only two alleles
C
Multiple alleles with codominance (I^A and I^B codominant, both dominant over i)
D
Incomplete dominance producing an intermediate phenotype in heterozygotes
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