A pea plant with round seeds (RR) is crossbred with another pea plant with wrinkled seeds (rr). What is the probability of the offspring having wrinkled seeds?

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Explanation:

The parent plants are each heterozygous for round seeds and heterozygous for wrinkled seeds. Each parent contributes one allele to the offspring plant. As such, the only possible genotype of all offspring plants would be Rr (which would have round seeds as round seeds allele is dominant). Hence, no offspring can have wrinkled seeds.