In a human's case, you would have 46 of them.

It now has four chromosomes.

Now, replication of these, so each of these chromosomes in this pair replicate.

I have 23 from my father.

They're being pulled apart, but they're being pulled apart the homologous pair is being pulled apart, not the actual chromosomes, not the chromatids.

It's just growing, accumulating materials and building itself out, and then it actually replicates its chromosomes.

So I have one chromosome from my dad, and it's made up of two chromatids, so it's already replicated, but we only consider it one chromosome, and then I have one from my mom in green.

And just like in mitosis, as soon as the sister chromatids are split apart, they are now referred to as chromosomes, or sister chromosomes.

This is its chromatin form.

You have your two chomosomes, each made with sister chromatids, each made with two sister chromatids.

let's say it has this chromosome right here.

Even though we have two chromatids, one for each chromosome, now we have four chromatids, two for each chromosome, we still say we only have two chromosomes.

You have replication of your DNA.

This will then go onto a robot that's going to apply one of those stains to it.

This is the reality.

And this all changed in the late 19th century.

Remember, in interface, even though I drew it this way, they don't exist in this state, the actual chromosomes.

And then let's say that last one actually helps to determine my gender, or it fully determines my gender.

He gets split up into two chromatids, which we are now calling chromosomes, or sister chromosomes.

I'll call it the allele straight for straight hair.

It's not like one is getting two versions of a gene and the other is getting two versions of another gene.

It's fuckedup chromosomes.

So let's say I have let me do it in appropriate colors.

So this is the one I got from my dad.

Sometimes this is called a tetrad because it has four chromatids in it, but it's in a pair of homologous chromosomes.

When we talk about meiosis, we have to be careful to show the homologous pairs.

I've zoomed in on just this part right here, where N is 1, where our full diploid complement is two chomosomes.

And you could already see, this process right here, you essentially split up your chromosomes, because you end up with half in each one, but here, you start with N and you end up with two chromosomes that each have N, so it's very similar to this.

So it's analogous to anaphase in mitosis, but the key difference is you're pulling apart homologous pairs.

It didn't have that crossover occur.

Then we very carefully melt onto the slide.

So let me say it has this chromosome right here and then

The cloth was dyed bright red.

So you have the longer purple one.

Tom dyed his hair brown.

And the adrenal glands make androgens, which are a masculinizing hormone.

And the first chromosome we built in 2008 the 500,000 base pair one we simply assigned the names of the authors of the chromosome into the genetic code, but it was using just amino acid single letter translations, which leaves out certain letters of the alphabet.

The nuclear envelope starts to disassemble, and then all of these guys align and the chromatin starts forming into these more tightly wound structures of chromosomes.

Henry, by virtue of being assumed to be male although I haven't told you that he's the XY one by virtue of being assumed to be male is now liable to be drafted, which Mary does not need to worry about.

Did you say she was wearing grey?

But you can also see things underneath there as well.

It's in its chromatin form.

Now we're in metaphase, and metaphase really is just an aligning of the chromosomes, so all of the chromosomes are going to be aligned at the center of the cell.

So let's say that's from my mother and that's from my father.

Wool takes a dye well.