Transcribed Image Text: QUESTION 4. Red-green color blindness is inherited in an X-linked recessive manner. Joe is red-green
color blind. Joe’s mother and father both have normal vision, but his mother’s father (i.e., Joe’s maternal
grandfather) is color blind. All of Joe’s other grandparents have normal color vision. Joe has three sisters
(Patty, Betsy, and Lora), all with normal color vision. Patty (Joe’s oldest sister) is married to a man with
normal color vision; they have two children, a 9-year-old color-blind boy and a 4-year-old girl with
normal color vision. Joe marries a woman who is a carrier of the color-blind allele; they are expecting
their first child. Patty & her husband are expecting their third child.
Homework • Unanswered
Which of the following scenarios has a greater probability of occurring and by how much?
Scenario 1: Joe’s first child will be a color-blind boy.
Scenario 2: Patty’s third child will be a color-blind boy.
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Scenario 1 has a greater probability of occurring than Scenario 2 by 100% (i.e., Scenario 2 is not possible).
Scenario 2 has a greater probability of occurring than Scenario 1 by 100% (i.e., Scenario 1 is not possible).
Scenario 1 has a greater probability of occurring than Scenario 2 by 25%.
Scenario 2 has a greater probability of occurring than Scenario 1 by 25%.
Scenarios 1 & 2 have an equivalent probability of occurring.