Multiple Choice
Which of the following statements about the phenotypic expression of genotypes is correct?
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13. Mendelian Genetics
Genotype vs. Phenotype
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Which of the following genotypes will express a dominant phenotype?
A
aa
B
Aa
C
AA
D
aA
Verified step by step guidance1
Understand that a dominant phenotype is expressed when at least one dominant allele is present in the genotype.
Recall that alleles are different forms of a gene, and they can be dominant or recessive. Dominant alleles are typically represented by a capital letter (e.g., 'A'), while recessive alleles are represented by a lowercase letter (e.g., 'a').
Identify the genotypes given in the problem: 'aa', 'Aa', 'AA', and 'aA'.
Recognize that the genotype 'aa' consists of two recessive alleles, which will not express the dominant phenotype.
Note that the genotypes 'Aa', 'AA', and 'aA' all contain at least one dominant allele ('A'), which means they will express the dominant phenotype.
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