A Family with Two Unaffected Parents and a Child with a Recessive

question 89

Multiple Choice

A family with two unaffected parents and a child with a recessive disease would like to know what the probability is that one of their unaffected children might be a carrier. What do you tell them?

• A) the chance that an unaffected child is a carrier is less than 50%
• B) the chance that an unaffected child is a carrier is 2/3
• C) the chance that an unaffected child is a carrier is 0%
• D) the chance that an unaffected child is a carrier is 75%
• E) the chance that an unaffected child is a carrier is 50%

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