Multiple choice

Brett syndrome is a rare form of mental retardation that can be more or less severe depending on the sex of the parent from whom it has been inherited. This unusual kind of inheritance pattern is known as

  1. a modifying gene inheritance

  2. genome imprinting

  3. incomplete penetrance

  4. pleiotropy
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B Correct answer
Explanation

When genes have a different effect depending on the gender of the parent from whom they were inherited, it is referred to as genome imprinting. Diabetes, psoriasis, and Prader-Willi syndrome are other examples of this phenomenon.

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