Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. A pansy that is homozygous for purple flowers (PP) is crossed with a pansy that is homozygous for pink flowers (pp). Which genotypes will be included for the offspring in the Punnett square for this cross?
The PP parent can contribute only a P allele, while the pp parent can contribute only a p allele. Combining those alleles gives Pp for every offspring, so the Punnett square includes Pp only.
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