How is punnett square a model for what happens during meiosis?

It's not. Sorry. A punnett square is used to calculate the genotype of the offspring of two people/animals/plants/whatever using the parents' genotypes.

Meiosis is the reproductive cells splitting and copying themselves, so you couldn't use a punnett square The Punnett square is a diagram that is used to predict the outcome of a particular cross or breeding experiment A Punnett Square is not applied to the individual meiotic events C.B.

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