Which of the following best describes alleles that are heterozygous?

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BlackTom AI · Accepted Answer

The core concept here is defining what heterozygous means at a genetic locus.
When an individual has two different alleles at the same gene locus, their genotype is heterozygous. For example, in a typical gene with alleles A and a, a genotype like Aa contains two distinct alleles, which is the classic representation of heterozygosity.
In contrast, homozygosity occurs when both alleles at a locus are the same, such as AA or aa.
Therefore, the statement that best describes alleles that are heterozygous is that they consist of two different alleles at the same genetic locus.
Note: The provided options field appears empty, so there is no alternative choice to compare against. If options were present, we would evaluate each one against the definition above and explain why identical alleles (homozygous) would be incorrect and why two different alleles accurately define heterozygosity.

SCI-BIO B Semester B Exam

Which of the following best describes alleles that are heterozygous?

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