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Unformatted text preview: Lecture 7 2/1/08 The ABO blood type system in humans provides examples of polymorphism, multiple allelism, complete dominance, and incomplete dominance. Antigen anything antibodies bind to. Usually proteins. Another example of multiple allelism or polymorphism. Clover is in the genus Trifolium. Presence/absence and shape of chevron pattern on leaves determined by several alleles. Page 227, 6.7 An interesting evolutionary question is why does evolution tolerate so many alleles at this locus. The type of dominance a trait shows may depend on the phenotypic level at which the observations are made. We will discuss the dominance interactions of the HBB allele and the HBS allele found at the locus coding for the B chain of the hemoglobin molecule. Sickle-cell anemia ppg. 226 6.5 An electron micrograph of blood cells including some cells with the sickle phenotype....
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