Multiple choice

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

  1. modifying gene

  2. genome imprinting

  3. incomplete penetrance

  4. codominance
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B Correct answer
Explanation

When genes have different effects 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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