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 various inheritance patterns such as incomplete dominance, codominance, multiple alleles, and polygenic inheritance.

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Define Complete Dominance.

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Complete dominance occurs when one allele completely masks the effect of another allele at the same locus. The dominant allele's trait is fully expressed in the phenotype.

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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.

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Explain 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 Polygenic Inheritance?

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Polygenic inheritance is a type of inheritance where multiple genes (often located on different chromosomes) influence a single trait, resulting in a continuous range of phenotypes.

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Define Multiple Alleles.

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Multiple alleles refer to the presence of more than two alleles for a genetic trait within a population, allowing for a variety of possible genotypes and phenotypes.

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Give an example of Complete Dominance.

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In pea plants, the allele for purple flowers (P) is completely dominant over the allele for white flowers (p). Thus, PP and Pp plants will both have purple flowers.

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Provide an example of Incomplete Dominance.

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In snapdragon flowers, crossing a red flower (RR) with a white flower (WW) produces pink flowers (RW), demonstrating incomplete dominance.

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What is an example of Codominance?

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In checkered chickens, the allele for black feathers (B) and the allele for white feathers (W) are both expressed, resulting in chickens with both black and white feathers.

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Describe an example of Polygenic Inheritance.

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Human skin color is an example of polygenic inheritance, where multiple genes contribute to the overall phenotype, resulting in a wide range of skin tones.