Multiple Choice
Which of the following genotypes is considered homozygous?
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13. Mendelian Genetics
Genotype vs. Phenotype
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In a population where the dominant allele for a trait is represented by 'A' and the recessive allele by 'a', what genotypes are possible for individuals expressing the dominant phenotype?
A
aa only
B
AA and aa
C
AA and Aa
D
Aa and aa
Verified step by step guidance1
Understand that the dominant phenotype is expressed when at least one dominant allele (A) is present in the genotype.
Identify the possible genotypes: Homozygous dominant (AA) and heterozygous (Aa) both express the dominant phenotype.
Recognize that the recessive phenotype is only expressed when the genotype is homozygous recessive (aa), which does not express the dominant phenotype.
Conclude that individuals with genotypes AA and Aa will express the dominant phenotype.
Remember that the presence of at least one dominant allele (A) in the genotype results in the expression of the dominant trait.
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