Introduction

• Chromosomal aberrations are changes in chromosome structure or number.
• Most chromosomal aberrations are known as aneuploidies, or different numbers of chromosomes other than pairs.
• A trisomy is an aneuploidy with one extra chromosome, for a total of 3, and a monosomy has one fewer chromosome, for a total of 1.

Types of chromosomal aberration

1. Structural change
2. Numerical change