Polygenic Inheritance

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What is polygenic inheritance?

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Polygenic inheritance is a type of genetic inheritance where multiple genes contribute to the expression of a single trait, resulting in a continuous range of phenotypes.

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What is the genotype of an individual with a recessive disorder in a pedigree?

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The genotype must be 'hh' for the individual to express the recessive disorder.

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What are polygenic traits?

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Polygenic traits are characteristics that are influenced by multiple genes, leading to a range of phenotypes, such as height or skin color.

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How do multiple genes affect traits in polygenic inheritance?

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Multiple genes contribute to the expression of a trait, each adding to the overall phenotype.

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What are the limitations of studying polygenic inheritance?

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Limitations include difficulty in identifying all contributing genes, the influence of environmental factors, and challenges in distinguishing genetic effects from environmental effects.

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What factors can explain variation in human height?

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Variation in height can be explained by polygenic inheritance and environmental factors such as nutrition.

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What is the difference between codominance and polygenic inheritance?

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Codominance involves the expression of both alleles in a heterozygote, while polygenic inheritance involves multiple genes affecting a single trait.

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Can polygenic traits be influenced by environmental factors?

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Yes, environmental factors can significantly influence the expression of polygenic traits.

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What is an example of a polygenic trait in humans?

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Height is a classic example of a polygenic trait, as it is influenced by multiple genes.

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What is the role of environmental factors in polygenic inheritance?

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Environmental factors can modify the expression of polygenic traits, leading to variations in phenotype.