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 Worked example: Using the Punnett square to predict phenotype and genotype ratios of simple crosses from genetic problems

Below is an example of a simple genetic problem with an explanation of a three step process to solve it using a Punnett square. You can practice doing it yourself in the Activity 'Can you use the Punnett square to predict ratios?'.

Problem: In pea plants, smooth seeds (S) are dominant to wrinkled seeds (s). In a genetic cross of two plants that are heterozygous for seed shape, what will be the ratio of smooth to wrinkled seeded offspring?

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Figure 1.2: Punnett Square worked example
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