stem cells

Question 1

f- o- undergoes m- and forms a ball of c- called an e-

Answer 1

fertilised ovum undergoes mitosis and forms a ball of cells called an embryo

Question 2

what happens to these cells (embryo) overtime

Answer 2

they continue to undergo mitosis and also change and form into specialised cells like nerve cells and muscle cells

Question 3

what have cells in the early embryo not done

Answer 3

they have not differentiated

Question 4

what is a stem cell and where is it

Answer 4

an undifferentiated cell so its capable of differentiating into any type of body cell and can produce more cells of the same type
its in the embryo

Question 5

where else are stem cells found

Answer 5

they can be in adult organisms like in humans in the bone marrow, they differentiate to form cells found in our blood

Question 6

why might someone with leukaemia receive a bone marrow transplant

Answer 6

the stem cells in the marrow can divide to form new bone marrow ad also differentiate and form blood cells

Question 7

whats a problem with donating bone marrow
2 ps

Answer 7

the donor must be compatible with the patient or else the cells produced ould attack the patients body
viruses could potentially be transferred from donor to patient

Question 8

what is theraputic cloning

Answer 8

an embryo is produced with the same genes as the patient, stem cells from the embryo can then be transplanted into the patient without being rejected by the immune system

Question 9

therputic cloning - once in what happens

Answer 9

the stem cells can differentiate to replace cells which have stopped working correctly

Question 10

why might people object theraputic cloning

Answer 10

due to ethical or religious concerns