Predicting Genotypes and Phenotypes. Punnett Squares -used to predict genotypes and phenotypes of offspring based on the parents genotype.

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Presentation transcript:

Predicting Genotypes and Phenotypes

Punnett Squares -used to predict genotypes and phenotypes of offspring based on the parents genotype

Punnett Squares Monohybrid crosses- 1 heterozygous trait is crossed (Bb X Bb) Dihybrid crosses- 2 heterozygous traits are crossed (BbSs X BbSs)

Punnett Squares (parent generation) Eye Color mom BBB b dad bb b Offspring 1Offspring 2 Offspring 3Offspring 4 Bb Genotypic Ratio Phenotypic Ratio

Punnett Squares (F1) Eye Color mom Bb Bb B dad Bb b Offspring 1Offspring 2 Offspring 3Offspring 4 BB bbBb Genotypic Ratio? Phenotypic Ratio?

Punnett Squares Eye Color and Heightmom BbSs BSBsbS bs BS Dad BbSs Bs bS bs BBSS BBSs BbSS BbSs BBSs BBssBbSsBbss bbSsbbSS BbSs BbSS Bbss bbSs bbss Genotypic Ratio? Phenotypic Ratio?

Laws of Probability Used to predict genotype or phenotype -Multiplication rule-to determine the probability of different events happening in combination, multiply the probability of each event. -Addition rule-to determine the probability of the same events happening add the probability of even event. See examples