Review: Non-Mendelian Inheritance

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What is Non-Mendelian Inheritance?

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Non-Mendelian inheritance refers to patterns of inheritance that do not follow Mendel's laws of segregation and independent assortment. It includes incomplete dominance, codominance, multiple alleles, and polygenic inheritance.

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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. Example: Red and white snapdragons produce pink offspring.

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What is codominance?

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Codominance is a form of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits. Example: AB blood type, where both A and B alleles are expressed.

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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. Example: Blood type in humans has three alleles: A, B, and O.

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What is polygenic inheritance?

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Polygenic inheritance is a type of inheritance where multiple genes influence a single trait, resulting in a continuous range of phenotypes. Example: Human height.

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What is the genotype of a person with blood type O?

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The genotype of a person with blood type O is OO.

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If a person with blood type AB marries a person with blood type O, what are the possible blood types of their children?

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50% A, 50% B.

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When red snapdragons are crossed with white snapdragons, the offspring produce pink flowers. What type of inheritance is this?

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This is an example of incomplete dominance.

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If a dark brown horse and a white horse are bred, and the offspring are palomino (tan), what type of inheritance is this?

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This is an example of incomplete dominance.

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In a plant species, if a plant with genotype Rr is crossed with a plant with genotype rr, what is the probability of obtaining a plant with red flowers?

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50%.