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

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BIOL 121
Carol Pollock

Biol 121 225 Freeman 282286Feb 10 10Ch 13Extending Mendels RulesFrom Genotype to Phenotype Complete dominance alleles are either dominant or recessive each allele codes for different phenotypes there is no intermediate phenotype eg black and white only no greywhen 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 What happens when ratios are when ratios are not what is expected then complete dominance is not the case not as expected based oncomplete dominance of a single it will be either incomplete dominance or codominance instead gene Incomplete dominance eg Four o clock flowersP Purple x White flowers F1 Expect all purple if purple is dominant but instead get all lavender this is the intermediate phenotype lavenderbt purple and whiteLavender x Lavender F2 1 purple2 lavender1 lavender RR2 Rrrrsame genotype as in complete dominance inheritance but different phenotype Codominance when codominance occurs heterozygotes individuals that are heterozygous for a gene have the phenotype asso
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