dumb question about chromosome/chromatid/homologous pairs

[ak47]

so humans have 46 chromosomes
Cliff's says that this is 23 homologous pairs for a total of 92 chromatids

?!?!?!

thanks!

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[osimsDDS]

yea thats right, Homologous pairs during meiosis are pairs of 2 so 2x23=46.
Also since it is going through meiosis the cell has to duplicate 46 (46x2=92) to get 4 cells of haploid number 23. chromatids = single chromosomes while homologous pairs =pairs (x2).

 

[userah]

23 homologous pairs means 46 chromosomes (one set from mother and one set from father) then each chromosome is made up of 2 chromatids; thus 46*2 = 92 chromatids total

 

[Hugh Mannity]

23 homologous pairs means 46 chromosomes (one set from mother and one set from father) then each chromosome is made up of 2 chromatids; thus 46*2 = 92 chromatids total

Not in G1 or G0 however.

 

[osimsDDS]

yea true because G1 the chromosomes dont replicate, thats before S phase, and if they dont have the right machinery or nutrients for replication it goes to G0....But I am pretty sure the person was talking about after S phase during prophase of M phase...

 

[gkhan]

key thing to remember in meiosis is that there are 2 "cycles" and before meiosis II the chormatids do NOT duplicate.

think of it like interphase->PMAT->MAT->4haploids