Situation in which an individual has different alleles making up the genotype for a particular trait.

Question

BlackTom AI · Accepted Answer

To begin addressing the question, we consider what it means for an individual to have different alleles making up the genotype for a trait.
Option A: Heterozygous. This precisely describes a genotype with two different alleles at a locus, such as Aa, which fits the prompt perfectly. The presence of two distinct alleles is the textbook definition of heterozygosity.
Option B: Autosomes. This term refers to the non-sex chromosomes in an organism, not to the composition of alleles at a specific gene locus. It does not answer the question about having different alleles for a trait.
Option C: Allele. An allele is a variant form of a gene, but the word alone does not specify whether the two copies are the same or different. The question requires describing the situation of having different alleles, so just 'allele' misses the required distinction.
Option D: Dominant. Dominant describes one allele’s effect over another at a locus, but it does not describe the genotype itself. You could have a heterozygous or homozygous genotype with a dominant or recessive phenotype; this term focuses on expression, not on whether the alleles differ.
Option E: Homozygous. This term means having two identical alleles at a locus (e.g., AA or aa). It is the opposite of the scenario described in the question, where the alleles are different.
In summary, the option that directly captures the situation of two different alleles at the same gene locus is A) Heterozygous, while all other options refer to different concepts related to chromosomes, types of alleles, or patterns of allele expression rather than the specific genotype composition.

Situation in which an individual has different alleles making up the genotype for a particular trait.

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