Multiple choice

A 15 year old boy develops a disorder, which is present in his father and no one else in the family is known to be affected. Which of the following modes of inheritance is least likely?

  1. Autosomal recessive

  2. Autosomal dominant

  3. X-linked recessive

  4. Sex-linked dominant
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An X-linked trait does not display male to male transmission. Any of the others are possible, including autosomal recessive, if the mother is also heterozygous (pseudo-dominant transmission).

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