That's the egg, and we all know how this story goes.

Sperm

And it's now ready to essentially turn into an organism.

So this very first cell that was created from this fertilized egg, this is called a zygote.

Just as an aside, this unification, this fertilization that occurred from this sperm cell to this egg cell, so it essentially penetrates into this egg cell and it creates this zygote, which is a fertilized egg cell from my mother, and this contains all DNA from both my father and my mother.

So that very first cell that was essentially my mom's egg fertilized by a sperm cell from my father, that was a zygote, and as soon as it's successfully fertilized, it has 2N, or it has the diploid number of chromosomes in the case of humans, which I believe I am one of them.

I had an artificial insemination with sperm from my husband.

Men, through their penis, they fertilize the eggs by the sperm coming out.

So we start with a zygote. This is a fertilized egg.

I had an artificial insemination by donor.

My father's sperm somehow met my mother's egg, and they fused.

Baby's first division

And this is where the system gets really interesting.

I had a mental blow at that time.

But even this process of fertilization is an incredibly competitive process, because this sperm that happened to be the one that kind of won the race from my father to fertilize my mother's egg, it was actually the first of roughly 200 million other sperms.

And it's really an odd sort of structure.

Let me do that Y chromosome in a separate color.

They produce these gametes.

I mean, he's gonna get another lecture, make another visit to the head shrinker.

And there are flowers that are self infertile.

Spare me. I've had my psych evaluation this month. I know.

But now with some of this vocabulary thrown out of the way, let's talk a little bit about zygotes and how do zygotes turn into people, and then how do those people essentially produce gametes, which then can fertilize other people's gametes to form more zygotes.

But I want to make the point here that embryos are being destroyed in other processes, and namely, in vitro fertilization.

And I said, Yeah.

The focus of this video is how this fertilized egg develops once it has become a zygote.

So we were inspired by the oyster, but I was also inspired by the life cycle of the oyster.

The male gamete fertilizes a female gamete.

And behold the glory and bounty that is Bronx County.

So he realized he had a set whose number of elements was larger than infinity.

For each homologous pair, I'm either going to contribute the one that I got from my mother or the one that I got from my father, right?

Benson and Holmes analyzed the psychological effect of artificial insemination on parents.

And I started to believe myself, I started to believe that I can do something again.

Now, in the case of humans, the diploid number is 46, so N is equal to 23.

It's our own pond. And that's how it happens.

She had a reputation for being well informed about her subjects.

These comb jellies and arrow worms produce, store and release both sperm and eggs.

So now let me pick a nice color.

I need to ask you to return with me to the beginning where each of us began.

All of the women I have worked with over a 12 year period, hundreds of them, they had all been sexually abused as children.

The cool thing is, what we're doing is we're changing the mind of Milo constantly.

TV is harmful in that it keeps your mind in a passive state.

This is TED logo.

It's the females, I think, that lay the eggs, and then the males fertilize them.

They actually perform a surgery, take them out of the ovaries of the mother, and then they fertilize them with semen, either it might come from the father or a sperm donor, so then all of these becomes zygotes once they're fertilized with semen.

The walls of the egg then become impervious to other sperm so that only one sperm can get in, but that's not the focus of this video.