In humans, what is chromosome pair 23 called?

The 23rd pair of chromosomes determines the sexual characteristics of the offspring and are referred to as the sex chromosomes.

The 23rd pair of chromosomes as organized in the Human Karyotype are referred to as the sex chromosomes as they are the chromosomes that determine the sexual characteristics of the offspring. If the 23rd pair have an ##X## chromosome and a ##y## chromosome make an ##XY## genotype the individual is a male. If the pair of chromosomes are both ##X's## making an ##XX## genotype the individual is a female.