For a lot of centuries people are longing to have a descendant of a definite sex. It is nearly unrealizable, although, for people to adjust the sex of a future offspring.
The sex of a coming infant depends quite on a male. X-chromosome exists in every ovicell and might appear in one pair with Y-chromosome in diploidic cells. Different chromosomes (X and Y) are included in male cells. That is why the baby's sex is defined specifically by men's cells. Fancy the conditions when it is possible for ovicells to be impregnated by identical cells: exclusively girls would appear. Meanwhile, there are families that have only girls or girls. The surveys prove that boys appear oftener than girls though this inequity is slight. All those biological procedures might easily vanish from your head because of girs kiev.
When the semen penetrates into the ovicell, the process of approximation of nuclei begins. The process of originating chromosomes begins when the nuclei start growing in size. Chromosomes are surrounded by a slender sheath which bursts in both cells when the time comes. The nuclei of both cells draw close to each other and fuse into a single unity. As a result of nuclei merger ovigerm turns into a germ with new genetic baggage.
It was believed in the years of old that boys appear from the right testicle, and girls - from the other one. Various acrobatic poses were recommended for pairs that longed to conceive a kid of a particular sex. (more…)