Never really understood chromosomes properly and now that it's come up again at a2 bio im lost so I need some things cleared up:
(also correct my mistakes please)
The X is made up of 2 chromatids. Each of your cells contains chromosomes both from your mum and you dad (so you have loads of pairs of X's one from your dad and one from your mum) 2 chromosomes that contain the same genes are called a homologous pair.(is this correct?)
A chromatid is a strand of DNA and a chromosome is just a pair of identical chromatids linked by a centromere.
In meiosis a homologous pair of chromosome is split so each chromosome is put into a different daughter cell and then in meiosis 2 these chromosome are then split in chromatids in different daughter cells.
In mitosis all the chromosomes both from your mum and dad are split by their centromeres and each chromatid is put into 2 daughter cells, so cells prtoduced are also diploid whereas in meiosis the cells produced are haploid.
(Original post by Yasin-Ali) The X is made up of 2 chromatids. Each of your cells contains chromosomes both from your mum and you dad (so you have loads of pairs of X's one from your dad and one from your mum)
See post above but as for the bold bit, by X you mean a chromosome I guess!?
I mean, bear in mind you didnt get 46 chromosomes from your dad and mom like for each cells in your body- the 46 chromosomes only inherited once in your life time
Its like there was a zygote which had the 46 chromosome then you get all your cells (with 46 chromosomes ) from the zygote