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 inheritance, including incomplete dominance, codominance, polygenic inheritance, and multiple alleles.

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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 flowers.

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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: Checkered chickens with black and white feathers.

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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 that of one of the homozygotes. Example: In star belly sneeches, the star trait completely dominates the non-star trait.

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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 skin color.

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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. Example: Blood types A, B, AB, and O are determined by multiple alleles.

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What is the phenotype of blood type O?

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Blood type O has no antigens A or B on the surface of red blood cells.

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What is the genotype of a pink snapdragon?

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The genotype of a pink snapdragon in incomplete dominance is heterozygous (Rr), where R is the allele for red and r is the allele for white.

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How can you determine if a trait is inherited through complete dominance?

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If a trait appears in the offspring that is identical to one of the parents and not a blend, it is likely inherited through complete dominance.

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What is an example of a trait that exhibits codominance in humans?

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An example of codominance in humans is the ABO blood group system, where individuals can have type AB blood, expressing both A and B antigens.