The Gene for Tay-Sachs Disease Codes for a Nonfunctional Form

question 26

Multiple Choice

The gene for Tay-Sachs disease codes for a nonfunctional form of the enzyme hexosaminidase A (or Hex A ) It has been found that a person with only one-third the maximum amount of Hex A can function absolutely normally. Please characterize the heredity of Tay-Sachs disease.

• A) codominant
• B) recessive
• C) dominant
• D) multiple allelic

---

Definitions:

European Heritage

Refers to the cultural, historical, and ancestral connections and contributions of European peoples and countries.

Surrogacy

An arrangement whereby a woman agrees to bear a child for another person or couple, who will become the child's parent(s) after birth.

Ultrasound

Prenatal diagnostic procedure in which high-frequency sound waves are directed at the mother’s abdomen to provide clear images of the womb projected onto a video monitor.

Fetus Genotype

The genetic makeup of a fetus, encompassing all the genes inherited from both parents.