Question

which chromosomal defect is caused when part of a chromosome breaks off and reattaches backward on the same chromosome? deletion translocation inversion insertion

Explanation:

• Deletion: A part of the chromosome is lost.
• Translocation: A part of a chromosome breaks off and attaches to a non - homologous chromosome.
• Inversion: A segment of the chromosome breaks off, flips (reverses its orientation), and reattaches to the same chromosome.
• Insertion: An extra segment of DNA is inserted into the chromosome.

Since the problem states that a part of the chromosome breaks off and reattaches backward (reversed orientation) on the same chromosome, the correct chromosomal defect is an inversion.

Answer:

inversion