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Biology Exam Questions

Question 1: Pea Plants and Punnett Square

Answer all questions, each carries equal marks: (K/U, TI, C, A) (marks 7X5=35)

1. In pea plants, yellow peas are dominant over green peas. Use a Punnett square to predict thephenotypes and genotypes of the offspring from a cross between a plant heterozygous for yellowpeas (Yy) and a plant homozygous for green peas (yy).

2. Explain why the DNA that makes up two sister chromatids is identical.

3. A probationary nurse mixed up the identification bracelets of three newborn babies. The bloodtypes of parents and babies were obtained in an attempt to identify the parents of each baby.

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