Which chromosomal pair determines the sex of an individual? Select one: a. 23rd b. 22nd c. 20th d. 19th

The correct answer is a. 23rd.The 23rd pair of chromosomes, also known as the sex chromosomes, determines the sex of an individual. In humans, there are two types of sex chromosomes: X and Y. Females typically have two X chromosomes (XX), while males have one X and one Y chromosome (XY). The presence of the Y chromosome determines male sex determination, while the absence of the Y chromosome results in female sex determination.