An organism that has two identical alleles for a trait is called what?

Study for the Biology 30 Genetics Test. Engage with a variety of question types, including multiple choice, flashcards, and detailed explanations. Ensure you're prepared for your exam day!

Multiple Choice

An organism that has two identical alleles for a trait is called what?

Explanation:
Having two identical alleles for a trait means the organism is homozygous for that gene. This means the two copies of the gene carry the same allele, such as BB or bb. The opposite situation is heterozygous, where the two alleles are different (like Bb). An allele is one version of a gene, while the genotype is the pair of alleles an organism has for that gene—whether they are the same (homozygous) or different (heterozygous).

Having two identical alleles for a trait means the organism is homozygous for that gene. This means the two copies of the gene carry the same allele, such as BB or bb. The opposite situation is heterozygous, where the two alleles are different (like Bb). An allele is one version of a gene, while the genotype is the pair of alleles an organism has for that gene—whether they are the same (homozygous) or different (heterozygous).

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