Genetics Practice

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What is Incomplete Dominance?

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A genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two traits.

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What is Co-Dominance?

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A genetic scenario where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.

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What is a Genotype?

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The set of genes carried by an organism, represented by letters (e.g., TT, Tt, tt).

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What is a Phenotype?

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The observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

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What does Homozygous mean?

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Having two identical alleles for a particular gene (e.g., AA or aa).

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What does Heterozygous mean?

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Having two different alleles for a particular gene (e.g., Aa).

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What is a Dominant Allele?

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An allele that expresses its phenotype even in the presence of a recessive allele.

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What is a Recessive Allele?

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An allele that only expresses its phenotype when two copies are present (homozygous).

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What is a Punnett Square?

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A diagram used to predict the outcome of a particular cross or breeding experiment, showing the possible allele combinations.

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What is a Trait?

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A characteristic or feature of an organism, which can be influenced by genetics and the environment.