Multiple Choice
In the context of variations of dominance, which statement best describes a recessive allele?
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3. Extensions to Mendelian Inheritance
Variations of Dominance
Multiple Choice
In the context of variations of dominance, which term describes a situation in which one allele masks or “overshadows” the phenotypic effect of another allele in a heterozygote?
A
Codominance
B
Complete dominance
C
Overdominance (heterozygote advantage)
D
Incomplete dominance
Verified step by step guidance1
Understand the concept of dominance in genetics, which describes how different alleles interact to produce a phenotype in a heterozygote.
Recall that in complete dominance, one allele completely masks the effect of the other allele in the heterozygous condition, so only the dominant allele's phenotype is observed.
Compare this with incomplete dominance, where the heterozygote shows an intermediate phenotype between the two alleles, and codominance, where both alleles are fully expressed simultaneously.
Recognize that overdominance refers to a situation where the heterozygote has a phenotype that is more advantageous or distinct compared to either homozygote, often called heterozygote advantage.
Conclude that the term describing one allele masking the phenotypic effect of another in a heterozygote is 'complete dominance'.
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