Multiple Choice
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?
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13. Mendelian Genetics
Genotype vs. Phenotype
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Which of the following genotypes is homozygous recessive?
A
aA
B
AA
C
Aa
D
aa
Verified step by step guidance1
Understand the concept of homozygous recessive: A genotype is considered homozygous recessive when it consists of two identical recessive alleles. In genetics, alleles are different forms of a gene, and recessive alleles are typically represented by lowercase letters.
Identify the alleles in each genotype: In the given options, each genotype consists of two alleles. For example, 'aA' consists of one 'a' and one 'A'.
Determine the nature of each genotype: Check if the alleles in each genotype are both recessive (lowercase).
Analyze the options: 'aA' has one dominant (A) and one recessive (a) allele, 'AA' has two dominant alleles, and 'Aa' has one dominant and one recessive allele.
Identify the homozygous recessive genotype: The genotype 'aa' is the only one with two identical recessive alleles, making it homozygous recessive.
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