Multiple choice

In a couple, if both mother & father are homozygous (xx) for a genetically inherited recessive defect, what is the probability that they will have a son or daughter who does not bear this defect?

  1. 0%

  2. 25%

  3. 50%

  4. 100%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since both parents are homozygous recessive (aa), all of their children will also express the trait. As a result, none of them will be free of this recessive trait in their phenotypes.

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