Sentences with phrase «sperm penetrate»

The pioneering research shows that when very few sperm penetrate a bird's egg, the embryo is unlikely to survive.

He's making my sperm penetrate her egg, and he's making sure that only one of the little guys is successful, because we all know how much fun triploidy can be.

Your egg is fertilized 12 to 24 hours later if a sperm penetrates it — and this simple biological occurrence begins a series of increasingly complicated processes that leads to a new human life, if all goes well.

Some female lizards can reproduce without sperm penetrating the egg, and the bdelloid rotifer, a microscopic moss dweller, has been asexual for 85 million years.

Shortly after a sperm penetrates an egg during fertilization, the sperm's mitochondria are degraded while the egg's mitochondria persist.

When a sperm penetrates the egg, it unwraps the centrosome, an organelle that acts like a construction foreman overseeing the creation of microtubules in the cell.

Not exact matches

Unlike humans, birds require multiple sperm to penetrate an egg to enable their chicks to develop normally.

Modern multicellular animals probably evolved from an ancestor very similar to a choanoflagellate, and animal sperm use enzymes similar to EroS to identify and penetrate eggs of the right species.

Albertini's group now suggests not only that these outside cells tell the egg where to locate the polar body — and, therefore, the nucleus and spindle — but also that their plumbing lines soften up the egg cell's rind in the opposite, or vegetal pole, to increase the odds that sperm will penetrate the hemisphere opposite the nucleus.

Vitality or motility of sperm refers to the ability of sperm to move to and penetrate the eggs.