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Published byGabriel Larivière Modified over 6 years ago
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Probability and inheritance of single traits
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Mendel’s Math Mendel allowed peas that were heterozygous for the seed shape to self-pollinate F2 generation 3:1 ratio (Phenotypic ratio) Each sex cell must have had an equal probability of getting the R allele as the r allele during segratation P= number of ways that given outcome can occur total number of possible outcomes
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Punnett square Predictor of phenotypes of the progeny
Allow us to determine the expected ratio of genotypes (Genotypic ratio) and the phenotypes for a cross, probability of the particular genotype/phenotype will occur in the progeny of a cross. Genotype of Rr:rr is 1:1 (2 Rr and 2 rr) Phenotypic ratio is 1:1 (1/2 round and ½ Wrinkled)
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What’s the probability that an offspring will have a phenotype of wrinkled seeds?
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Test Cross Cross of an individual of unknown genotype to an individual with recessive genotype – simplest way of determining genotype of an individual Phenotype of the F1 generation of a test cross reveal whether an individual with a dominant trait (R) is homozygous (RR) or heterozygous (Rr) for the dominant allele
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Pardon the Punnett Practice Questions 3 and 5 pg 604
Station practice Punnett Practice
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