Multiple Choice
In the context of variations of dominance, what best defines a recessive allele?
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3. Extensions to Mendelian Inheritance
Variations of Dominance
Multiple Choice
In a case of complete dominance, which genotype is guaranteed to show the dominant phenotype?
A
Only
B
Only
C
or
D
Only
Verified step by step guidance1
Understand the concept of complete dominance: In complete dominance, the dominant allele (represented as 'A') completely masks the effect of the recessive allele ('a') in the heterozygous genotype.
Identify the genotypes involved: The three possible genotypes are homozygous dominant (AA), heterozygous (Aa), and homozygous recessive (aa).
Recall the phenotype expression: Both AA and Aa genotypes will show the dominant phenotype because the presence of at least one dominant allele 'A' is enough to express the dominant trait.
Recognize that only the homozygous recessive genotype (aa) will show the recessive phenotype, as it lacks the dominant allele.
Conclude that the genotypes guaranteed to show the dominant phenotype in complete dominance are both AA and Aa.
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