mitosis

Question 1

prophase

Answer 1

• chromosomes condense and become visible
• centrioles move to opposite sides of the nucleus and form poles
• nuclear membrane breaks down
• centrioles form spindle fibres between the two poles
• centromere of each chromosome attaches to spindle fibres extending from each pole (1st step)

Question 2

anaphase

Answer 2

-spindle fibres contract, splitting the centromeres and separating the sister chromatids
-the single-strand chromosomes are separated
-chromosomes are pulled to opposite poles
(3rd step)

Question 3

metaphase

Answer 3

• chromosomes align at equatorial plane of cell

- spindle fibres attach to centromeres of chromosomes (2nd step)

Question 4

telophase

Answer 4

-nucleus membrane reforms around the two sets of chromosomes
-spindle fibre disappear
-chromosomes become longer and thinner
(4th step/ last step)