Ch. 8 (Pt. 2)

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Biology - Biological Sciences
BSC 2010
Gerlach, Nicole

2/20/13 Ch. 8 I. Vocabulary A. Locus - specific place along a chromosome that is often used interchangeably w/ gene but can refer to non-coding DNA II. Mendel A. Second experiment differed in 2 characteristics: seed shape and color B. Dihybrid cross - crossing F1 generation C. Independent assortment of dihybrid crossing: 9:3:3:1 phenotype ratio D. Mendel's Second Law: Law of Independent Assortment 1. Alleles of different genes assort independently during gamete formation III. Interaction to Produce Phenotypes A. Incomplete Dominance - heterozygote has intermediate phenotype B. Misconceptions: 1. Dominant alleles are not necessarily the most common in the population nor the "best" allele 2. Dominant alleles do not "inactivate" or "destroy" recessive alleles C. Complete dominance - where enzyme is sufficient to produce the dominant trait D. Incomplete dominance = where 1 unit of enzyme is insufficient to produce the dominant trait E. Polymorphic - consists of more than 2 alleles 1. In
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