Multiple choice

A couple has a daughter suffering with Tay Sachs disease, and 4 normal children. Neither parent nor any of the four biological grandparents of the affected daughter had this disease. The most likely genetic condition leading to Tay Sachs disease is

  1. sex-linked recessive

  2. autosomal recessive

  3. autosomal dominant

  4. sex-linked dominant
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It must be recessive because both parents are normal, but one or both parents must have passed the disease allele to their daughter. Since one or both parents are heterozygous and are not affected by the Tay-Sachs allele, the disease must be recessive.

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