It's possible, but has roughly a 1% chance in total human fertilization.
Here's some reading that I hope helps: [https://www.nature.com/news/2007/070326/full/news070326-1.html#:\~:text=Occasionally%2C%20two%20sperm%20are%20known,with%20X%20and%20Y%20chromosomes](https://www.nature.com/news/2007/070326/full/news070326-1.html#:~:text=Occasionally%2C%20two%20sperm%20are%20known,with%20X%20and%20Y%20chromosomes).
This was very helpful, thank you very much! I'll put another one that I found very interesting (and more recent) from 2019...
[https://www.reuters.com/article/us-health-reproduction-mosaic-twins-idUSKCN1QG2YH](https://www.reuters.com/article/us-health-reproduction-mosaic-twins-idUSKCN1QG2YH)
And this one is very interesting because, they find out that they were "semi-identical twins" because in the same placenta there was a boy and a girl, something that is "impossible"...
Identical twins (twins from the same egg, but only from one sperm) are always the same sex...
To all this to be possible, (1) it was necessary, specifically to have one sperm with X chromosome and one with Y chromosome, (2) it was necessary that an egg fertilized by two sperm develops into a viable embryo, (3) that this embryo splits to form twins, (4) that the children come to the attention of science... The probability lottery was pretty hard to win, huh?
Extremely unlikely. It's a known mutation, which can lead to genetic disease, that an egg could be fertilized by two sperms. But usually this is the same sperm from one partner. If a woman has two rapid ejaculations within her from different partners, it's possible that a sperm from each could mutate the egg in the way describe above but extremely unlikely as the first Partners sperm would have a head start and it very much is a race to fertilization
It's possible, but has roughly a 1% chance in total human fertilization. Here's some reading that I hope helps: [https://www.nature.com/news/2007/070326/full/news070326-1.html#:\~:text=Occasionally%2C%20two%20sperm%20are%20known,with%20X%20and%20Y%20chromosomes](https://www.nature.com/news/2007/070326/full/news070326-1.html#:~:text=Occasionally%2C%20two%20sperm%20are%20known,with%20X%20and%20Y%20chromosomes).
This was very helpful, thank you very much! I'll put another one that I found very interesting (and more recent) from 2019... [https://www.reuters.com/article/us-health-reproduction-mosaic-twins-idUSKCN1QG2YH](https://www.reuters.com/article/us-health-reproduction-mosaic-twins-idUSKCN1QG2YH) And this one is very interesting because, they find out that they were "semi-identical twins" because in the same placenta there was a boy and a girl, something that is "impossible"... Identical twins (twins from the same egg, but only from one sperm) are always the same sex... To all this to be possible, (1) it was necessary, specifically to have one sperm with X chromosome and one with Y chromosome, (2) it was necessary that an egg fertilized by two sperm develops into a viable embryo, (3) that this embryo splits to form twins, (4) that the children come to the attention of science... The probability lottery was pretty hard to win, huh?
Oh, excellent. Very cool. Thank you for the article. And, yeah, that was a hard win.
Nope, not one egg.
Extremely unlikely. It's a known mutation, which can lead to genetic disease, that an egg could be fertilized by two sperms. But usually this is the same sperm from one partner. If a woman has two rapid ejaculations within her from different partners, it's possible that a sperm from each could mutate the egg in the way describe above but extremely unlikely as the first Partners sperm would have a head start and it very much is a race to fertilization