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lesson pretestMultiple Choice

Pretest

Question 1 • CMS 2026-2027 Biology CREDIT RECOVERY

Many different types of mutations can occur within the body. Tay-Sachs disease is a deadly disorder that is caused by a missing codon in the gene coding for production of the hex A enzyme in the body. Which type of mutation is responsible for causing Tay-Sachs disease?

Answer
A
replacement
B
insertion
C
substitution
D
deletion

Explanation

A codon is a group of three DNA or RNA bases. Tay-Sachs in this question is caused by a codon being missing, which means bases have been removed from the gene. Removing genetic material is a deletion mutation, so the correct choice is deletion.

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