What is the meaning of aneuploidy?

Aneuploidy:

1. The presence of an abnormal number of chromosomes in an organism is called aneuploidy.
2. It could be an occurrence of one or more chromosomes or missing chromosomes.

Examples of Aneuploidy:

1. Normally humans have 46 chromosomes.
2. In Klinefelter's Syndrome, males have an extra copy of the X chromosome(XXY). The total number of chromosomes becomes 47, it is referred to as trisomy.
3. In Turner's syndrome, a female is born with the absence of an X chromosome (XO). Total number of chromosomes gets reduced to 45. It is referred to as monosomy.