Question

17 multiple choice 2 points identify the structure \a\ in the diagram. 18 multiple choice 2 points which will most likely cause a gene to mutate?

Explanation:

For question 17, the centromere is the constricted region of a chromosome as shown by structure A. For question 18, radiation is a well - known mutagen that can cause changes in the DNA sequence of a gene.

Answer:

1. centromere
2. radiation