Paul Child defines a man, or rather, his sperm carrying the X (girl) — Or Y (boy) chromosome. If women bred parthenogenesis (asexual), they would have only been born a girl.
However, the understandable desire of the parents as soon as possible to find out: what color sliders to choose available shops galore?
Accuracy of determining the sex of the fetus depends primarily on the duration of pregnancy and, unfortunately, the experience of the expert. To
The optimal time to answer the question cherished —
Chorionic villus sampling. Often, future mothers and fathers are asked: is it possible to determine the sex of the child is not visually by ultrasound (as we have seen, this method is hardly infallible), and
Amniocentesis. It looks like this: on the age 16-18 weeks through a small puncture drawing small amounts of amniotic fluid and examined her chromosomal makeup. Amniocentesis — invasive (penetrating) method of diagnosis, that is, it is associated with certain risks for mother and baby. Therefore, only for the satisfaction of his parents do not — only to identify the genetic and chromosomal disorders. But in these cases, sometimes floor is everything: some diseases are transmitted only to girls or only boys. Normally, the results of amniocentesis calm, and the sex of the baby's parents learn healthy, they say, in passing. The reliability of the results — 99%.
Cordocentesis. This method study is similar to the previous one, only for the study of fetal umbilical cord blood is taken. Cordocentesis helps identify these sex-linked genetic diseases, such as hemophilia. Do it in the same terms as amniocentesis.
American scientists have developed a method for separating sperm containing
The method is based on determining the amount of genetic material in cells. Sperm with
The procedure consists of several steps: (1) staining of DNA, (2) sorted by number of sperm DNA, and (3) separation of sperm
However, even this method can not be considered infallible. And it is interesting that the "obedient" were the sperm responsible for conceiving girls: at the end of the procedure described in the test sample of sperm
The developed method is designed to help couples for which a risk of having a child with a genetic disease that selectively affects only people of a certain gender (men only or women only).
In conclusion, we want to remind dear fathers and mothers: not you, not a doctor or ultrasound decide replenish your family is a boy or a girl. The main thing — from the early days of conception to love someone who will soon be born, and even before he was born to do everything possible to ensure that his life was as happy as possible.
According to the magazine "9 months" Number