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Punnett Squares Used to calculate the probability chance of passing a trait on to offspring.

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Punnett Squares Used to calculate the probability chance of passing a trait on to offspring.

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    1. Punnett Squares Used to calculate the probability (chance) of passing a trait on to offspring. The 4 monohybrid crosses.

    2. Purebred Dominant x Purebred Recessive (PP x pp) Genotype Ratio: All Pp Phenotype Ratio: All Dominant

    3. 2. Purebred Dominant x Hybrid (BB X Bb) Genotype Ratio: ½ BB: ½ Bb 1BB:1Bb 50%BB:50%Bb Phenotype Ratio: All Dominant

    4. 3. Hybrid x Hybrid (Bb x Bb) Genotype Ratio: ¼ BB: ½ Bb: ¼ bb 1BB:2Bb:1bb 25%BB:50%Bb:25%bb Phenotype Ratio: 3Dominant: 1Recessive

    5. 4.) Hybrid x Purebred recessive Bb x bb Genotype Ratio 2Bb:2bb Phenotype Ratio ½ Dominant: 1/2 Recessive Test Cross = (B? x bb) Used to determine the genotype of a dominant individual. Why do you use a homozygous recessive mate for a test cross?

    6. Summary of the 4 crosses

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