Multiple choice

In a couple, if a woman is homozygous normal (XX ) and her husband is heterozygous ( Xx) for a genetically inherited recessive disease, what is the probability that they will have a healthy offspring?

  1. 1 out of 4

  2. 2 out of 4

  3. 3 out of 4

  4. 4 out of 4
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D Correct answer
Explanation

All of the children will be healthy since none of them can be homozygous recessive (xx). However, there will be a 50% chance at each birth that the children will be carriers (Xx). The remaining 50% will be homozygous dominant (XX).

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