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Lecture 6 - Codominance One allele is said to exhibit...

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Lecture 6 1/30/08 Y-linked inheritance: Only a few dozen loci are located on the human Y chromosome. The SRY gene, also called testis determining factor, determines maleness. Chapter 6: Gene Interaction A goal of genetic analysis is to identify all the genes that affect a specific phenotype and to understand their genetic, cellular, developmental and molecular roles. Interactions between the alleles at one locus. Types of dominance Students should know two examples for each of the following types: One example from the disease sickle cell anemia and one other example. Complete dominance Incomplete dominance Codominance Complete Dominance: One allele is completely dominant to another when the heterozygote has the same phenotype as one of the two homozygotes. The dominant allele is said to be the one found in the homozygote that has the same phenotype as the heterozygote. Incomplete dominance: One allele is said to be incompletely dominant to another allele when the heterozygote has a phenotype that is intermediate between the two homozygotes.
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Unformatted text preview: Codominance: One allele is said to exhibit codominance with respect to another allele when each allele produces its full phenotype in the heterozygote. Polymorphism in the loosest sense means that there exists in a population more than one discretely different forms of a character. In the most qualified sense, polymorphism refers to the existence of more than one allele at a locus in a population. At least two of the alleles have to have a proportion greater than . 01. Multiple allelism refers to the existence of more than two alleles at locus. Usually, of course, MA means that a population has the strictest sense of polymorphism. May not necessarily be the case. The ABO blood type system in humans provides examples of poly, MA, dominances. HW: C3 – p. 89 – 106 Skip recombination go to p. 112. (Section 3.5) 114: stop no cytoplasmic segregation. 116: Stop. Solved 1,2 1 2 5 6 7 8 9 14 16 17 18 19 20 21 22 23 25 27 36 37 38 40...
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