BIOL 102 Lecture Notes - Lecture 22: Molecular Genetics, Hemoglobin, Y Chromosome

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4 Jan 2021
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Incomplete dominance: the phenotype of heterozygotes is intermediate between the. Alleles arise through mutation, and the same gene in different individuals may have different mutations, each producing a new allele. Therefore, although an individual can have at most two different alleles, a species may have multiple alleles of many of its genes. The human blood types are an example of multiple alleles of a single gene: blood types a, b, ab, and o arises from three different alleles of a single gene on chromosome 9. Codominance = the pattern of inheritance when heterozygotes express phenotypes of both of the homozygotes (ex. having both a and b glycoproteins for blood type). Polygenic inheritance = a form of inheritance in which the interaction of two or more genes contributes to a single phenotype. Human height, weight, skin color, and eye color are traits not governed by single genes but influenced by interactions among two or more genes, and interactions with environment.

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