Biology Revision Part 2

The process of meiosis has two distinctive stages. Division 1: the pairs pair up, exchange their chromatids, break up

Then a chromosome from each pair goes to one of two poor cells And yet again, we're doing well. Division 2: (we're almost through)

The chromatids they move apart. And four new cells Begin to start. In humans, each with 23 Chromatids for you and me.

The process of meiosis gives genetic variation. What a wonderful creation! Through independent segregation ...

And a cool recombination of the chromosomes like little gnomes with different coloured hats and that is that.

Except it's not. Alleles are forms of certain genes They decide What colour eyes you end up with - your blood type, height and other things.

Crossing over happens in Division 1 when chromatids twist together (shut up heather! ;) ) creating tensions that break off the chromatids poor legs and stuff.

These broken limbs then join back up with other chromatids Creating brand new combinations - hence genetic variation.