31. A man with blue eyes (genotype bb) and a woman with brown eyes (genotype Bb)

Question

31. A man with blue eyes (genotype bb) and a woman with brown eyes (genotype Bb) have a child with blue eyes. What is the probability that their next child will also have blue eyes? A. 25% B. 50% C. 75% D. less than 50% because the first child had blue eyes Genetics Exercises-see page 47, 50 and 53 in your textbook for examples of Punnett square diagrams. 1. Fill in the following Punnett square diagram for the children of a couple in which the woman is genetically normal and the father has the gene for Huntington disease (H), which is autosomal dominant Mother's genotype-hh (normal) h Father's genotype Hh Huntington) a) What percentage of their offspring will be genotype Hh? b) Will any of their children be phenotypically normal, but carry the gene for Huntington? Fill in the following Punnett square diagram for the children of a couple in which both parents carry the gene for cystic fibrosis (e), which is autosomal recessive 2. C c

Explanation / Answer

(31)A.25%

When the cross was calculated between both the parents the probability for both brown and blue eyes were 50%.

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