Types of Dominance Practice Activity

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What is Complete Dominance?

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A type of inheritance where the phenotype of a heterozygote is the same as the phenotype of the dominant homozygote. The dominant allele completely masks the effect of the recessive allele.

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What is Co-Dominance?

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A type of inheritance 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 Incomplete Dominance?

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A type of inheritance where the phenotype of a heterozygote is a blend of the two parental traits, resulting in a third phenotype.

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Example of Complete Dominance?

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In pea plants, if a plant with a dominant allele for tallness (T) is crossed with a recessive allele for shortness (t), all offspring will be tall (Tt).

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Example of Co-Dominance?

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In chickens, crossing a black feathered chicken with a white feathered chicken results in checkered feathered offspring, showing both traits.

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Example of Incomplete Dominance?

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In snapdragon flowers, crossing red flowers with white flowers produces pink flowers, a blend of both colors.

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What is the phenotype of a heterozygote in Complete Dominance?

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The phenotype is that of the dominant allele.

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What happens in Co-Dominance?

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Both traits are expressed simultaneously in the phenotype of the heterozygote.

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What is the result of Incomplete Dominance?

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The traits appear to blend together, creating a new phenotype.

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How does Complete Dominance affect offspring?

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Offspring will display the dominant trait if at least one dominant allele is present.