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AS BIO- edexcel unit 2

hey guys
Just wanted too know tbe difference between epigentic modification and cell specialisation? I know the main concept of it but am unable to recongzise which process to write for a given question.. any one knows the main diff behind it or any tip to recongnize the q

Thank you
Original post by nighthawk123
hey guys
Just wanted too know tbe difference between epigentic modification and cell specialisation? I know the main concept of it but am unable to recongzise which process to write for a given question.. any one knows the main diff behind it or any tip to recongnize the q

Thank you

well epigenetic modification is the mechanism for cell specialization, through epigenetic modification, which occurs in stem cells, certain genes switched on and off, by dna methylation, histone modification etc, and the active genes can be transcribed to form mrna which is translated to form a speicifc polypeptide which causes the permanent change in cell structure and function- which is cell specialization/differentiation. As you can see, through epigenetic modification, cell specialization occurs.
Original post by Abraham_Otaku
well epigenetic modification is the mechanism for cell specialization, through epigenetic modification, which occurs in stem cells, certain genes switched on and off, by dna methylation, histone modification etc, and the active genes can be transcribed to form mrna which is translated to form a speicifc polypeptide which causes the permanent change in cell structure and function- which is cell specialization/differentiation. As you can see, through epigenetic modification, cell specialization occurs.


then when does this process takes place

1.stem cells divide by mitosis
External signals e.g. growth factors/hormones cause:
Only some genes to be activated/expressed
This produces different sets of mRNA inside the cell
This produces different proteins
The different proteins inside a cell give it a different structure/function

NOTE- this does involve explaination of DNA methylation or epigentic modification yet its cell specailsation

im sorry if these questions are dumb but i am really confused
Original post by nighthawk123
then when does this process takes place

1.stem cells divide by mitosis
External signals e.g. growth factors/hormones cause:
Only some genes to be activated/expressed
This produces different sets of mRNA inside the cell
This produces different proteins
The different proteins inside a cell give it a different structure/function

NOTE- this does involve explaination of DNA methylation or epigentic modification yet its cell specailsation

im sorry if these questions are dumb but i am really confused

well in epigenetic modification, genes are activated or repressed.
in cell specialisation, it is a stem cell at the beginning which can change into any type of cell,so by activitating some genes, you result in a protein that controls what cell function of the stem cell will be i.e what is specialises to,
in epigenetic modification, the cell is already there. its not a stem cell, it just has some genes that will turn active for a function. but overall specialisation of that cell has already been decided
Original post by nighthawk123
then when does this process takes place

After mitosis, so that stem cell numbers can increase, and because once cell differentiation had occurred , its no longer a stem cell(but rather some specific cell type), and can therefore no longer undergo mitosis.
Original post by Abraham_Otaku
After mitosis, so that stem cell numbers can increase, and because once cell differentiation had occurred , its no longer a stem cell(but rather some specific cell type), and can therefore no longer undergo mitosis.

thank you guys

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