b2.1.4 - mitosis

Question 1

mitosis

Answer 1

Cell division which produces two identical diploid daughter cell
mitosis increases the number of cells
mitosis occurs to replace worn out cells, repair damaged tissue and enable and organism to grow

Question 2

cell cycle

Answer 2

process of cell growth and division
4 stages - DNA replication, movement of chromosomes, cytokinesis, growth of daughter cell

Question 3

how is dna replicated

Answer 3

1) dna molecule unzips forming two separate strands
2) dna bases on each strand are exposed
3) free nucleotides in the nucleus line up against each of the strands following complementary base pairing
4) this forms dna base pairs
5) when the whole strand is complete, there are two identical molecules of dna

Question 4

how do chromosomes move?

Answer 4

1) chromosomes line up across the centre of the cell

2) two identical copies of each chromosome - formed when the dna replicated - separate and move to opposite ends of the cell
3) each end now contains a full set of identical chromosomes
4) two new nuclei then form

Question 5

Cytokinesis

Answer 5

The cell membrane pinches in and eventually divides into two daughter cells

Question 6

Why is it called a cycle?

Answer 6

Daughter cells produced will begin replicating their dna and cycle will repeat