20.2

Question 1

Stem Cells

Answer 1

• Keep dividing
  -Undifferentiated
  -Can develop into other cells

Question 2

Totipotent cells

Answer 2

-Can differentiate into any body cell
-Form embryo and placenta
-All genes in nucleus are activated

Question 3

Pluripotent

Answer 3

• Can differentiate into almost any type of cell
  -Found in embryo

Question 4

Multipotent

Answer 4

-differentiate into limited number specialised cells
-adult stem cells
-umbilical cord blood stem cells

Question 5

Unipotent stem cells

Answer 5

-differentiates into single type of cell
-made in adult tissue
-e.g. cardiomyocytes(heart musle cells)

Question 6

Induced pluripotent stem cells

Answer 6

• iPS are pluripotent
  -produced from unipotent by genetic alteration in lab
  -genes and TF are switched on or off
  -capable of self-renewal(limitless supply)
  -more ethical than embryos

Question 7

Use of pluripotent

Answer 7

-regrow tissue
e.g. beta cells for diabetes
skin cells for burns
cardiomyocytes for heart damage
nerve cells for paralysis

Question 8

Embryo ethics

Answer 8

• fetus isn’t respected human life
• could progress to use of newborn babies
• could move towards reproductive cloning
  -could be use for fertility tratments
  -