Often used to describe an early pregnancy in which a heartbeat has been seen. A microscopic infectious organism that reproduces inside living cells. The thickness of semen. Female's external genitalia. The congenital, developmental, or genetic information in the cell that transmits the information necessary to make a female.
All eggs contain one X chromosome, and half of all sperm carry an X chromosome.
When two X chromosomes combine, the baby will be a girl. The Y chromosome can be found in one-half of the man's sperm cells. When an X and a Y chromosome combine, the baby will be a boy. The protective outer membrane surrounding the egg. A fertilized egg which has not yet divided.