This question is a bit misleading. Every human cell normally has 46 chromosomes, arranged in 23 pairs. However, individuals with Turner syndrome have only one complete X chromosome, rather than the usual two (XX). This means they have 45 chromosomes total.
Important Note: This is a genetic condition that affects only females. The Y chromosome is responsible for determining "maleness," so if it's missing, as in Turner syndrome, the sex of the child will invariably be female.
