2 - BIO 320: Lecture 2 Probablity; Exceptions to Mendelian...

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Interactions between genes can result in modified Mendelian ratios- e.g. flower color in sweet peas and the 9:7 ratio Genotype Phenotype C/- P/- Purple C/- p/p White c/c P/- White c/c p/p White Consider di-hybrid cross C/C P/P x c/c p/p C/c P/p C/- P/- C/- p/p c/c P/- c/c p/p 9 3 1 9 Purple 7 White 3 self-cross of F1 progeny A model for this type of interaction: Both the C and P gene products are in the biochemical pathway responsible for synthesis of purple pigmentation Other types of genetic interactions, and thus other modified Mendelian ratios are possible! : BIO 320: Lecture 2 Probablity; Exceptions to Mendelian genetics: Not all alleles show a simple dominant/recessive relationship Incomplete dominance -flower color in snapdragons Genotype Phenotype Red Pink White Consider monohybrid cross Identical phenotypicand genotypic ratios are observed in F 2 generation!! self-cross of F1 progeny Codominance - blood group type in humans Genotype Phenotype Blood type A Blood type B Blood type O
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2 - BIO 320: Lecture 2 Probablity; Exceptions to Mendelian...

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