Non Mendelian Genetics

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What is Non-Mendelian Genetics?

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Non-Mendelian 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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Define 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 an example of Incomplete Dominance?

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An example of incomplete dominance is the flower color in snapdragons, where crossing red (RR) and white (WW) flowers produces pink (RW) flowers.

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Define Codominance.

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Codominance is a genetic scenario 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 an example of Codominance?

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An example of codominance is the AB blood type, where both A and B alleles are expressed equally.

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What is the phenotype of a flower with genotype RW in snapdragons?

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The phenotype of a flower with genotype RW in snapdragons is pink.

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What is the expected percentage of offspring with blood type O from a cross between two heterozygous parents (AO x BO)?

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The expected percentage of offspring with blood type O is 25%.

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What does it mean if a trait is said to be 'dominant'?

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A dominant trait is one that is expressed in the phenotype even when only one copy of the allele is present.

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What does it mean if a trait is said to be 'recessive'?

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A recessive trait is one that is only expressed in the phenotype when two copies of the allele are present.

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What is the significance of multiple alleles in genetics?

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Multiple alleles refer to the presence of more than two allele options for a gene, allowing for a greater variety of phenotypes.