Final answer:
The 23rd chromosome pair that results in the zygote becoming female is XX, with one X chromosome coming from each parent.
Step-by-step explanation:
The 23rd chromosome pair that consists of two X-shaped chromosomes, one each from the mother and the father, which leads to the zygote becoming a female, is XX. The sex chromosomes are responsible for determining an individual's sex. Females typically have two X chromosomes (XX), while males have one X and one Y chromosome (XY). It is of note that in females, one X chromosome is inactivated to become a Barr body, ensuring that both sexes have only one functioning copy of the X chromosome per cell. In instances of sex-linked inheritance, these chromosomes determine whether a baby will be male or female.