The Student Room Group

asexual reproduction

if a starfish is cut into segments,each of its segment can grow into a starfish.however, humans cannot regenerate themselves.why do you think so?
adult stem cells in humans can only differentiate into a limited number of other cells, but in a starfish their stem cells can differentiate into any cell that may be needed in the body
starfish has totipotent cells,which can differentiate into any cell or tissue of the body which is why they can grown from samll fragments.adults have mostly specialised cells and a few pluripotent,so they cannot.hope this helps!
Reply 3
Original post by shallowdeep2
starfish has totipotent cells,which can differentiate into any cell or tissue of the body which is why they can grown from samll fragments.adults have mostly specialised cells and a few pluripotent,so they cannot.hope this helps!

well, i got it!!thanks...
(edited 10 months ago)
well,now that i answered your question,i just have realised how do they have eyes and body?if they have unspecialised cells?
Reply 5
hmmm...tahts a good question!anyone's got an answer?
Original post by shallowdeep2
well,now that i answered your question,i just have realised how do they have eyes and body?if they have unspecialised cells?

their cells can specialise into any cell that is needed - every cell has all the genetic information needed to code for any cell, the cell effectively 'switches on' the genes that code for that particular cell and 'switch off' the genes that are not required for the cell.
Reply 7
Original post by flowersinmyhair
their cells can specialise into any cell that is needed - every cell has all the genetic information needed to code for any cell, the cell effectively 'switches on' the genes that code for that particular cell and 'switch off' the genes that are not required for the cell.


so that concludes the fact that human cells are unable to 'switch off' their genes.is it correct?
Original post by Saeed23
so that concludes the fact that human cells are unable to 'switch off' their genes.is it correct?

individual cells are able to 'switch off' genetic information if it is not required for the function of that cell, but that genetic information could be used in a different cell if it is required for the function of the cell.

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