BIOL 121 Lecture : Biol 121- 2010.02.10- Genetics- Beyond Mendel (Ch. 13).docx

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22 Apr 2012
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BIOL 121 Full Course Notes
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BIOL 121 Full Course Notes
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13 extending mendel"s rules from genotype to phenotype. Alleles are either dominant or recessive, each allele codes for different phenotypes. There is no intermediate phenotype (e. g. black and white only, no grey) When an individual is heterozygous for a gene (one dominant allele, one recessive), the individual will have the dominant phenotype. The individual will only have the recessive phenotype if the individual has two recessive alleles. When ratios are not what is expected, then complete dominance is not the case. It will be either incomplete dominance or codominance instead. e. g. four o" clock flowers. F1: expect all purple (if purple is dominant), but instead get all lavender. This is the intermediate phenotype (lavender = b/t purple and white) F2: 1 purple : 2 lavender : 1 lavender (rr : 2 rr : rr same genotype as in complete dominance inheritance, but different phenotype)

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