In humans, which chromosome constitution corresponds to a female?

• A. XY
• B. XX
• C. YY
• D. X0

Answer: (D)

In humans, female development is normally associated with having two X chromosomes. This XX pattern leads to the typical female phenotype when a Y chromosome is not present. There is a rare exception known as Turner syndrome, where an individual has only one X chromosome (X0). These individuals are female in appearance and development but have specific health and fertility differences. So the usual female chromosome set is XX, while X0 describes Turner syndrome rather than the standard female constitution.