Multiple Choice
Which of the following statements about the genetic makeup of a normal gamete is correct?
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1. Introduction to Genetics
Fundamentals of Genetics
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If an individual is heterozygous for a particular trait, which of the following best describes their genotype?
A
They have two different alleles for the gene controlling the trait.
B
They have two identical alleles for the gene controlling the trait.
C
They lack any alleles for the gene controlling the trait.
D
They have only one allele for the gene controlling the trait.
Verified step by step guidance1
Understand the definition of heterozygous: an individual is heterozygous for a gene if they possess two different alleles for that gene.
Recall that alleles are different versions of the same gene, and each individual inherits one allele from each parent, resulting in two alleles per gene locus.
Recognize that if the alleles are identical, the individual is homozygous, not heterozygous.
Note that lacking alleles or having only one allele is not typical for diploid organisms, which normally have two alleles per gene.
Conclude that being heterozygous means having two different alleles for the gene controlling the trait.
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