fertilization

The sperm can’t make the journey on its own, and the real story of fertilization involves two reproductive systems working together.

So researchers’ ability to retrieve and prepare this scarce resource for fertilization, and if necessary preserve the eggs through freezing, have all been crucial in assisting reproduction.

Scientists have known for some time that human eggs undergoing in vitro fertilization could be genetically altered.

Later this year, the startup also plans to begin offering embryo testing, which will involve extracting a few cells from embryos created by in vitro fertilization, sequencing their DNA, and generating similar risk reports.

That moment is called gastrulation, and for humans, it occurs about two weeks after egg and sperm meet in fertilization.

Or are they used in an evolutionary battle of the sexes over who has the last say in fertilization?

Fertilization rates and implantation rates were similar—about 35 percent.

But the cross-fertilization of advertising and art also worked the other way.

"The females are enormously, amazingly successful at preventing fertilization by forced copulation," he said.

And it would incite fierce resistance from those who believe life begins at fertilization.

In the flower where the father and mother part matures at the same time, self-fertilization is the rule.

The fertilization and growth of plants are regarded as processes resembling the procreation of man.

They are easily worked and very quickly respond to fertilization and thorough cultivation.

This embryo is the product of fertilization of a germinal vesicle by a pollen tube.

In the second class, if we count conjugation as a simple form of fertilization, there are only two types of reproductive methods.