[Androide89]

I don't get how a 46/4n cell (after replication) can become two 46/2n cells (after mitosis) and also become two 23/2n cells (after meiosis 1), can some please explain this cytologically or clarify it somehow. thanks

 

[Androide89]

so the "n" refers to the number of chromatids? In kaplan under embryo meiosis section it says spermatogonia (46/2n) replicate their dna to have 46/4n dna, then undergo meiosis 1 and the daughter cells have 23/2n, shouldn't it be 23/4n because only the chromosomes split, not the chromatids (the 23 chromosomes still have 4 chromatids). Hope this makes sense.

 

[Androide89]

yeah i got the mitosis part down but even from that diagram, i dont get the meiosis and how it goes from 46/4n to 23/2n and eventually 23/1n, grr