Florida Biology EOC Practice Test 2025 - Free Biology End-of-Course Practice Questions and Study Guide

Question: 1 / 400

What does it mean if an organism is 'heterozygous'?

Having different alleles for a trait

An organism is considered heterozygous if it has different alleles for a particular trait. This means that it has inherited two different versions of a gene, one from each parent. Option B can be ruled out because it describes a homozygous organism (having identical alleles), which is the opposite of heterozygous. Option C may be confusing as it is describing incomplete dominance or co-dominance, which are not necessarily characteristics of heterozygosity. Finally, option D may be misleading as traits from both alleles are not always expressed in the offspring's phenotype but rather depend on the dominance of one allele over the other. Therefore, the most accurate answer is A.

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Having identical alleles for a trait

Alleles for the genes are neither dominant nor recessive

Traits from both alleles are expressed in phenotype of offspring

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