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.
Pap test. The Papanicolaou test (abbreviated as Pap test, known earlier as Pap smear, cervical smear, or smear test) is a method of cervical screening used to detect potentially pre-cancerous and cancerous processes in the cervix (opening of the uterus or womb).n the United States, Pap smear screening is recommended starting around 21 years of age until the age of 65. Guidelines on frequency vary from every three to five years. If results are abnormal, and depending on the nature of the abnormality, the test may need to be repeated in six to twelve months.