Achromosome that is exposed to a mutagen breaks into two pieces. a portion off one of the ends is removed before the two pieces rejoin. the mutation that occurs is

The correct answer is deletion mutation.

Explanation:

A deletion mutation takes place when a section or a part of the molecule of a DNA does not get copied at the time of the replication of the DNA. This uncopied section can be as large as an entire chromosome, or can be as small as a single nucleotide. The absence of this DNA at the time of replication can result in a genetic disease. A deletion mutation may result in the shifting of a base sequence, making the base sequence's reading frames to modify at the time of translation.

hello there the answer is d