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Embryos develop after fertilization.
Ah okay - I never realized that distinction; or I did, but I'm having a moment. :D
Additionally, I didn't realize embryos could be frozen.
Not only can they be frozen, but when they're frozen and you drop them in coca cola light, they work even better than mentos!
It’s quite common. People do it all the time for IVF.
I'm guessing the distinction here that allows this is that the cells haven't differentiated into more complex structures that could be damaged by cryogen.
True. Problem is, I would consider the question still valid on the basis that not every embryo successfully implants.
IVF can up the odds of success by using multiple embryos at the same time in the hopes that at least one of them will work, which is why people who go for IVF sometimes end up having quadruplets and such.
So every time one or more IVF attempts fail, what, they have to inform the government their 7th child in a row has died? Every post-coital period, do I hedge my bets?
Agreed. That said, I was just correcting the above commenter on the biology. It looks like they didn’t actually know when an embryo became an embryo. And it’s after fertilization. And even then, many fertilized eggs don’t actually become embryos.