Massachusetts Comprehensive Assessment System (MCAS) Biology Practice Test

Humans typically have 46 chromosomes, which are organized into 23 pairs. This diploid number means that individuals inherit one set of 23 chromosomes from each parent, making a total of 46. These chromosomes contain the genetic information necessary for the development, functioning, and reproduction of the human body.

The 23 pairs consist of 22 pairs of autosomes and one pair of sex chromosomes. The presence of this specific number of chromosomes is crucial for maintaining genetic stability and ensuring proper cell division during processes such as mitosis and meiosis. In humans, deviations from this typical number can lead to genetic disorders or syndromes, highlighting the importance of having the correct chromosomal count for normal development.