Mitosis occurs in pretty much all of our somatic cells as our skin cells replicate, and our hair cells and all the tissue in our body as it duplicates itself, it goes through mitosis.

It's a germ cell.

I was there.

Which is best, white thread or red thread?

Which is better, red thread or white thread?

It's short.

We have a video on it where we go into the phases of it prophase, metaphase, anaphase and telophase.

That's normally accompanied by cytokinesis where the cytoplasms of the cells actually separate.

In a female, they would be involved in the ovaries.

So what I want to do is say to a future bug,

And formally, mitosis is really the process of the duplication of the nucleus, but it normally ends up with two entire cells.

So let me draw a germ cell.

2,200 acres in size, 2,000 years old.

She sews with a needle and thread.

And the most studied silk line of them all major ampullate silk.

Now, most of these cells of this human being, if this is me or you, these are all the product of mitosis that started off with that zygote, and it just kept dividing and dividing and dividing into mitosis.

So those are my centromeres.

Coloured cotton.

Just like Moses called it.

The frame and radii of this web is made up of one type of silk, while the capture spiral is a composite of two different silks the filament and the sticky droplet.

Do you see that blind thread that missed the weave and lies on top of the others?

But some of the toughest hurdles have been the technical ones.

So this is cytokinesis, which is formally not a part of mitosis, but it normally occurs with the telophase, so right at the end of mitosis, you do normally have two complete identical cells.

And so we wanted to think if there couldn't be a different way that bacteria live.

The silkworm is spinning a thread.

When you look at this orb web, you're actually seeing many types of silk fibers.

You can think of histones like molecular spools.

Oh, that's the storeroom for canvas and Dacron and And line.

And then you can guess what happens in anaphase Il.

You did it. You did it.

To answer that, you have to look a lot closer at the spinneret region of a spider.

We'll do a whole series of videos on the actual mechanics of that, but it splits by a mechanism called mitosis.

We do chemistry in organic solvents.

It has four pairs of large eyes, curved legs, eight curved legs, and spinnerets.

So the first steps that are really necessary for mitosis actually occur outside of mitosis when the cell is just doing its day to day life, and that's during the interphase.

You can see multiple fibers coming out of the spinnerets, because each spinneret has many spigots on it.

I think it's important.

I got no strings to hold me do...

A long thread is easily entangled.

A long piece of thread easily becomes tangled up.

Now, once we're at this stage, each of these cells now undergo meiosis Il, which is actually very similar to mitosis.

Cytokinesis takes place.

Let me erase all of that.

Let me draw that there.

And, of course, they're being aligned.