Florida Biology EOC Practice Test

Question: 1 / 400

If an organism is heterozygous, what does it have?

Genes arranged in pairs on chromosomes

Identical alleles for a trait

Different alleles for a trait

If an organism is heterozygous, it has two different alleles for a particular trait. This means that each parent has contributed a different version of the gene, resulting in genetic diversity. Option A is incorrect as genes are always arranged in pairs on chromosomes, regardless of whether an organism is heterozygous or not. Option B is incorrect as heterozygous organisms have different alleles, not identical ones. Option D is incorrect as not all heterozygous organisms exhibit mutant alleles.

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Mutant alleles that affect phenotype

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