If Someone Who Is Heterozygous for (Or a Carrier Of)

question 34

Multiple Choice

If someone who is heterozygous for (or a carrier of) a recessive genetic disease has a child with another heterozygous carrier, what are the chances that their child will have (come down with) the disease? (Make an inheritance diagram on scratch paper if it will help you to think this through.)

• A) none in four (0%)
• B) one in four (25%)
• C) two in four (50%)
• D) three in four (75%)
• E) four in four (100%)

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