True-breeding organisms are defined as

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Study for the 9th Grade Biology SOL Test. Prepare with flashcards and multiple choice questions, each featuring hints and explanations. Get ready for your exam!

Multiple Choice

True-breeding organisms are defined as

Explanation:
True-breeding means two identical alleles for a trait, so the organism is homozygous. Because both gametes carry the same allele, self-fertilization always passes that allele to all offspring, yielding the same genotype and phenotype every generation. For example, a plant with AA or aa will produce only AA or only aa offspring. If the organism is heterozygous (Aa), self-crossing creates a mix of genotypes and phenotypes, so it isn’t true-breeding. Dominance or recessiveness across all traits isn’t what defines true-breeding; it’s the presence of two identical alleles for the trait.

True-breeding means two identical alleles for a trait, so the organism is homozygous. Because both gametes carry the same allele, self-fertilization always passes that allele to all offspring, yielding the same genotype and phenotype every generation. For example, a plant with AA or aa will produce only AA or only aa offspring. If the organism is heterozygous (Aa), self-crossing creates a mix of genotypes and phenotypes, so it isn’t true-breeding. Dominance or recessiveness across all traits isn’t what defines true-breeding; it’s the presence of two identical alleles for the trait.

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