mitosis

Question 1

what is mitosis?

Answer 1

division of the nucleus

Question 2

what controls cell division?

Answer 2

the nucleus

Question 3

what did mitosis result in?

Answer 3

the formation of two identical daughter nuclei

Question 4

what is cell division a means of?

Answer 4

increasing the number of cells in an organism

Question 5

what is the chromosome complement?

Answer 5

the number of chromosomes present in each cell

Question 6

who has a chromosome complement?

Answer 6

every species

Question 7

what does mitosis do?

Answer 7

• maintains the chromosome complement

- provides new cells for growth and repair of damaged cells

Question 8

what are the stages of mitosis?

Answer 8

stage 1: the chromosomes shorten, thicken and become visible, while doubling to form two identical chromatids

stage 2: the nuclear membrane breaks down

stage 3: nuclear membrane has disappeared, spindle fibres have formed, chromosomes line up at the equator of the cell

stage 4: spindle fibres pull the chromosomes apart into chromatids, one chromatid from each pair moves south and the other goes north

stage 5: the cytoplasm starts to divide and a nuclear membrane forms around each set of chromatids, which have now become chromosomes again

stage 6: the cytoplasm has divided completely and two identical daughter cells have been formed

Question 9

why is it important for mitosis to maintain the chromosome complement?

Answer 9

each cell needs to have the same number of chromosomes to function properly