Key Area 1- Producing new cells

Question 1

What are 4 reasons why cells need to divide?

Answer 1

-Growth
-Repair of damaged cells
-Replacement of damaged or dead tissues
-Maintains the diploid chromosomes complement

Question 2

Name the 5 steps of mitosis

Answer 2

1) Chromosomes shorten and thicken
2) Chromosomes line up along the equator and spindle fibres attach
3) Spindle fibres pull chromatids apart to opposite poles
4) Nuclear membrane reforms
5) Two daughter cells are formed- both dipliod

Question 3

What are stem cells?

Answer 3

Unspecialised cells

Question 4

What are stem cells needed for?

Answer 4

Growth and repair

Question 5

What are the two things stem cells can do?

Answer 5

1) Become specialised
2) Self renew- make more stem cells

Question 6

What are the two types of stem cells called?

Answer 6

Embryonic and Tissue(adult) stem cells

Question 7

Which type of stem cell can become any type of specialised cell?

Answer 7

Embryonic stem cell

Question 8

What is a hierarchy?

Answer 8

Specialised cell -> Tissue -> Organ -> System