Florida Biology EOC Practice Test

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Prepare for the Florida Biology EOC Test. Use our comprehensive flashcards and multiple-choice questions, complete with hints and explanations, to get ready for your Biology End-of-Course exam!

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

Having different alleles for a trait
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

The correct answer is: 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.