Amt. of DNA when beginning Prophase?

[delempicka]

Before beginning Mitosis...after replication...

I'm thinking the cell has 2x the amount of DNA in G2, so are there 46 chromosomes - each which will condense into sister chromatids during prophase- technically leaving 92 double helices of genetic information during Mitosis?

Is this correct?

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[Will Hunting]

Before beginning Mitosis...after replication...

I'm thinking the cell has 2x the amount of DNA in G2, so are there 46 chromosomes - each which will condense into sister chromatids during prophase- technically leaving 92 double helices of genetic information during Mitosis?

Is this correct?

Yep. There are 46 chromosomes. They get replicated. Then they move to prophase and condense. There are 92 "chromosomes" now. However, each chromosome (46) is made of two identical "chromosomes" called chromatids. There are 92 double helices making up the 92 "chromatids." After anaphase, each cell has 46 sister chromatids which are now considered chromosomes. So now, a chromatid is officially a chromosome.

 

[delempicka]

thanks. so i was right! that's encouraging!