Complete Dominance, Incomplete Dominance, Codominance

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What is complete dominance?

Back

A genetic inheritance pattern where one allele is completely dominant over another, resulting in the dominant trait being expressed in the phenotype of the heterozygote.

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What is incomplete dominance?

Back

A genetic inheritance pattern where neither allele is completely dominant, resulting in a blending of traits in the phenotype of the heterozygote.

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What is codominance?

Back

A genetic inheritance pattern 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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Example of complete dominance in plants?

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In pea plants, the allele for tall stems (T) is completely dominant over the allele for short stems (t). A Tt plant will be tall.

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Example of incomplete dominance in flowers?

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In snapdragon flowers, crossing red (RR) and white (WW) flowers produces pink (RW) flowers.

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Example of codominance in animals?

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In roan cattle, both red (RR) and white (WW) hairs are expressed, resulting in a coat that is a mix of red and white.

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What is the probability of offspring having black fins from a cross between a purebred black-finned whale (FF) and a white-finned whale (ff)?

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100% will have black fins (Ff).

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What is the probability of obtaining a pink flower from a cross between a red flower (RR) and a white flower (WW)?

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100% will be pink (RW).

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What does a Punnett square illustrate?

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A Punnett square is a diagram used to predict the genotypes of a particular cross or breeding experiment.

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What is the significance of Mendel's experiments?

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Mendel's experiments established the basic principles of heredity, including the laws of segregation and independent assortment.