Multiple Choice
Which of the following is an example of a genotype (the allele combination an individual carries for a gene)?
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1. Introduction to Genetics
Fundamentals of Genetics
Multiple Choice
In a diploid organism, which genotype is heterozygous at a single gene locus?
A
Aa
B
A
C
AA
D
aa
Verified step by step guidance1
Understand the definition of heterozygous: an organism is heterozygous at a gene locus if it has two different alleles for that gene.
Recall that in diploid organisms, each gene locus has two alleles, one inherited from each parent.
Identify the genotypes given: 'AA' and 'aa' are homozygous because both alleles are the same, while 'Aa' has two different alleles.
Therefore, the genotype 'Aa' represents a heterozygous condition at the gene locus.
Summarize that heterozygous means having one dominant and one recessive allele, which is exactly what 'Aa' shows.
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