Cell Division

Question 1

Why do animals need constant new cells?

Answer 1

-Growth
-Repair
-Development

Question 2

What are the 3 main stages of the “Cell Cycle”

Answer 2

-Growth
-DNA replication + mitosis
-Division (cytokinesis)

Question 3

Cell cycle - Growth

Answer 3

-cell grows in size
-increases the number of sub-cellular structures
it contains e.g. mitochondria and ribosomes

Question 4

What happens to the DNA strings as it prepares for division

Answer 4

-DNA condenses into chromosomes

Question 5

Why cant some species produce fertile offsprings?

Answer 5

They have a different amount of chromosome pairs

Question 6

Cell cycle - DNA replication + Mitosis

Answer 6

-Duplicate each chromosomes which are
attached together
-They all line up at the centre of the cell
-cell fibres pulls each arm of the same
chromosome to the poles breaking the
chromosome into halves
-

Question 7

Cell cycle - Division (cytokinesis)

Answer 7

-Cell membrane and cytoplasm pulls apart
forming 2 identical daughter cells
- cells have the same DNA