Multiple Choice
Which allele combination represents the heterozygote advantage in a population?
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22. Evolution of Populations
Genetics and Allele Frequencies
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In genetics, a human carrier is also known as which of the following?
A
Heterozygote
B
Homozygote recessive
C
Hemizygote
D
Homozygote dominant
Verified step by step guidance1
Step 1: Begin by understanding the term 'carrier' in genetics. A carrier is an individual who has one copy of a recessive allele that does not manifest as a trait because the dominant allele masks its expression.
Step 2: Recall that a heterozygote is an organism with two different alleles for a particular gene, one dominant and one recessive. This matches the definition of a carrier.
Step 3: Review the other options: 'Homozygote recessive' refers to an individual with two recessive alleles, which would express the recessive trait, not a carrier. 'Homozygote dominant' refers to an individual with two dominant alleles, which would not carry a recessive allele. 'Hemizygote' refers to having only one allele for a gene, typically seen in sex-linked traits in males.
Step 4: Compare the definitions and eliminate the incorrect options based on the explanation above. The term 'heterozygote' aligns with the concept of a carrier.
Step 5: Conclude that the correct answer is 'Heterozygote,' as it accurately describes a human carrier in genetics.
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