Ovum chooses sperm for fertilization, and not vice versa: scientists

Previously it was thought that fertilization occurs in random order on the principle of "one of spematozoidov before he ran." Now scientists say that the egg is able to draw the right is her sperm.

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Scientists at the Pacific Northwest Research Institute (US) through research discovered that the egg approves or rejects sperm. This happens all at the cellular level, so the fertilization process more complicated than we thought.
Earlier it was believed that fertilization takes place on Mendel's laws. According thereto, reproduction occurs randomly. When each parent has two copies of their genes, the genes are distributed on gametes and each gamete receives only one copy of the gene.
Scientists have conducted two experiments that pointed to a new theory. In one experiment, female mice carrying the gene for ovarian cancer, males were healthy. Fertilization in line with Mendel's law. In the second experiment, the males were carriers of the mutated gene, but no females. It was then that the law of Mendel was not confirmed. According to him, 75% of the offspring had to get a mutation, but it was only 27%, because the egg is "pulling away" healthy sperm.

How is the choice?

Scientists believe that one of the leading roles is played by a molecule folic acid. Their metabolism is different in the egg and sperm. They may be attracted. Also, there is another version of the attraction, according to which, until the sperm are in a woman's body, egg divides his cell so that it fit perfectly genes sperm.

And that other sperm?

Do others have no role in fertilization and only one winner? The rest of the sperm and egg hyping help dissolve its shell. But "sucks" is just a "chosen one".

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