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    Ok, so I'm doing Edexcel AS Bio (new 2015 spec) but am having trouble with this past paper practical question...

    (Edexcel Unit 2 June 2013 Q4a)
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    totipotency is the ability of a single cell to divide. to measure this you would produce or use a premade culture to determine how many cells have been produced from the original cell.
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    Totipotency (as in totipotent stem cells) has to do both with dividing potential, and with the ability to give rise to any cell type in the body.
    I believe you would get a mark for defining this.

    Using tissue culture, you could say you use cells from the seeds to establish cell lines that can divide indefinitely. Then you could suggest that exposure to different stimulants and proteins could cause differentiation of cells originating from the same stem line, to give rise to different structures making up the plant
 
 
 
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