The sex of a baby is determined by the two sex chromosomes inherited from the parents. A baby will normally inherit one sex chromosome from the mother, and one from the father. A woman has two X chromosomes, so she can give either of her X chromosomes.The father can give either his X or Y chromosome. girl baby will result if the final arrangement is XX, and a boy will result if it is XY. As you would expect, about half of the sperm cells contain an X chromosome, and half contain a Y chromosome. It is possible to have an abnormal number of sex chromosomes, however, this is extremely rare.
So the old recommendation of when to begin Pap smear testing has changed. This testing should start either at age 21 or three years after the start of sexual activity. (âPrematureâ Pap smears can pick up minimal changes that wonât result in cancer, but will cause concern and lead to extensive, unnecessary testing.). So, for a young teenager who is not sexually active, her first visit to a gynecologist need not include a Pap smear. But other important health issues should be addressed at this critical juncture between adolescence and adulthood.
You should start getting regular Pap tests at age 21. The Pap test, which screens for cervical cancer, is one of the most reliable and effective cancer screening tests available.The only cancer for which the Pap test screens is cervical cancer.he Pap test is recommended for all women between the ages of 21 and 65 years old, and can be done in a doctor's office or clinic. During the Pap test, the doctor will use a plastic or metal instrument, called a speculum, to widen your vagina.