Complex Inheritance

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What is Complex Inheritance?

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Complex inheritance refers to patterns of inheritance that do not follow the simple Mendelian rules of dominance and recessiveness. It includes codominance, incomplete dominance, multiple alleles, and polygenic traits.

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Define Codominance.

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Codominance is a type of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits simultaneously.

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What is Incomplete Dominance?

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Incomplete dominance is a form of inheritance where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes.

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What is Complete Dominance?

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Complete dominance occurs when the phenotype of the heterozygote is the same as the phenotype of one of the homozygotes.

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What are Multiple Alleles?

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Multiple alleles refer to the presence of more than two alleles for a genetic trait within a population.

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What is a Polygenic Trait?

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A polygenic trait is controlled by multiple genes, resulting in a continuous range of phenotypes.

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Example of Codominance in humans.

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An example of codominance in humans is the ABO blood group system, where individuals with genotype I^AI^B express both A and B antigens.

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Example of Incomplete Dominance in flowers.

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An example of incomplete dominance is when a red flower (RR) and a white flower (WW) produce pink flowers (RW).

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What is the phenotype of a person with genotype I^Bi?

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The phenotype of a person with genotype I^Bi is type B blood.

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What is the significance of multiple alleles in genetics?

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Multiple alleles increase genetic diversity and can lead to a wider range of phenotypes within a population.