Nonmendelian Genetics

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What is Nonmendelian Genetics?

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Nonmendelian Genetics refers to patterns of inheritance that do not follow Mendel's laws of inheritance, including incomplete dominance, codominance, and multiple alleles.

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What is incomplete dominance?

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Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two.

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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 offspring with a phenotype that is neither dominant nor recessive.

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What is a homozygous genotype?

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A homozygous genotype consists of two identical alleles for a particular gene, either dominant (AA) or recessive (aa).

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What is a heterozygous genotype?

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A heterozygous genotype consists of two different alleles for a particular gene, one dominant and one recessive (Aa).

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What phenotype results from a heterozygous genotype in snapdragons?

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In snapdragons, a heterozygous genotype (Rr) results in a pink flower phenotype due to incomplete dominance.

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What is the result of a cross between RR and rr in snapdragons?

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The cross between RR (red) and rr (white) results in 100% pink flowers (Rr) due to incomplete dominance.

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What is the result of a cross between BW and BW in chickens?

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The cross between BW (black and white) and BW results in 25% black (BB), 50% black and white (BW), and 25% white (WW) feathers.

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What is the genotype for type A blood?

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The genotype for type A blood can be either AA (homozygous) or Ao (heterozygous).

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What is an example of codominance in cattle?

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In a certain breed of cattle, both red and white hairs show up together, demonstrating codominance.