definitions- lqc 4a

Question 1

stem cell

Answer 1

An undifferentiated (unspecialised) cell that can give rise to other specialised cell types. No limit to division . Can be totipotent, pluripotent or multipotent.

Question 2

totipotency

Answer 2

When an undifferentiated stem cell can give rise to all specialised cell types (216 in the human body). No limit to division. All genes switched on.

Question 3

pluripotency

Answer 3

When an undifferentiated stem cell can give rise to most specialised cell types except totipotent embryonic stem cells. No limit to division. Some genes switched off.

Question 4

multipotency stem cell

Answer 4

An undifferentiated cell which can give rise to only specialised cell types of a closely related family. Many genes switched off.