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Sperm in sentence

153 examples of Sperm in a sentence

And in this scenario, I want to imagine that, in one case, the sperm is carrying a Y chromosome, meeting that X chromosome of the egg.
And in the other case, the sperm is carrying an X chromosome, meeting the X chromosome of the egg.
It's not just my work in amphibians, but similar work has been shown in fish in Europe, holes in the testes and absence of sperm in reptiles in a group from South America and in rats, an absence of sperm in the testicular tubules as well.
And of course, we don't do these experiments in humans, but just by coincidence, my colleague has shown that men who have low sperm count, low semen quality have significantly more atrazine in their urine.
The first approach is to try and interfere with the way the sperm swim towards or bind to the egg.
Why? Turns out that men make a lot of sperm.
Men make a thousand sperm every second and to have an effective contraceptive, you need to get that level of sperm production down to one percent of its normal value.
Testosterone and progesterone, when administered together, will suppress the signals from the brain to the testes to make sperm, and in about 90 percent of men, sperm production after three to four months will stop.
Well, for over 90 years it's been known that you need vitamin A to make sperm.
Animals who are deprived of vitamin A in their diet stop making sperm and restart making sperm again when the vitamin A is reintroduced.
The blockade of this enzyme should deprive the testes of retinoic acid and stop sperm production without affecting vitamin A's functions elsewhere in the body.
A man could test his sperm count and share the result with his partner.
If the man's sperm count were zero, the man and his partner would feel very comfortable relying on his contraceptive.
And they will live for 15 or 20 years, continuing to lay eggs using the sperm from that original mating.
Difference human/Neanderthal is sperm and testis, smell and skin.
And I think we see this tremendous variation because it's a really effective solution to a very basic biological problem, and that is getting sperm in a position to meet up with eggs and form zygotes. Now the penis isn't actually required for internal fertiliztion, but when internal fertilization evolves, penises often follow.
In fact, the whole technology of sperm extraction for spinal cord-injured males was invented by a veterinarian.
He carried this big leather bag full of sperm probes for all of the animals that he'd worked with, all the different animals.
From your sperm tests we can confidently say that you're basically a form of birth control."
They'd been struck by a sperm whale, which had ripped a catastrophic hole in the ship's hull.
The most exciting thing for Bob Lanza is the ability now to take any kind of cell with induced pluripotent stem cells and turn it into germ cells, like sperm and eggs.
It's like the new sperm donor.
When I made love with my wife, I had no sperm that came out of me; I had blood.
A single sea hare will inseminate the partner in front of it and receive sperm from the one behind, which is sort of like an awesome time-saver, when you think about it.
Now the average human ejaculate has about 300 million sperm cells, so it's already a competitive environment.
The question is whether these sperm are competing against other men's sperm or just their own.
They keep the sperm cells cool so you can have frequent ejaculations.
It leaves the [body of the male], finds the female through pheromonal cues in the water, attaches itself to her body and deposits the sperm.
And it uses this dexterity to bypass the vagina altogether and deposit sperm directly into the female's uterus, not to mention it's a pretty good size.
We have to think about function as well, and when it comes to sex, function relates to the contributions made by the gametes, or the sperm and the eggs.
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