Aneuploidy is defined as what?

Aneuploidy refers to an abnormal number of chromosomes in a cell, which can manifest as either the gain or loss of chromosomes from the normal diploid state. The term encompasses various specific conditions, such as trisomy (gaining an extra chromosome) and monosomy (losing one chromosome). Therefore, defining aneuploidy as an incorrect number of chromosomes captures its essence accurately, as it emphasizes that the total chromosome count deviates from what is typically expected.

In this context, other definitions focus on specific scenarios, such as the gain or loss of one or more chromosomes, but they do not capture the broader meaning. Thus, the choice that identifies aneuploidy as an incorrect number of chromosomes provides the most comprehensive understanding of the condition.