Cell Division: Stages of mitosis

Question 1

What are the 4 stages of mitosis called?

Answer 1

= Prophase
= Metaphase
= Anaphase
= Telophase

Question 2

What happens during prophase?

Answer 2

= chrosomes condense- becomes visible in the nucleus
= nucleolous dissapears
= nuclear membrane breaks down
= a pair of centrioles move to either pole of the cell
= proteins begin to form spindle fibres attach to the centromere of each chromosome
=move the chromosomes to the centre of the cell
=

Question 3

What happens in metaphase?

Answer 3

= spindle apparatus has completly formed
= chromosomes are lined up at the centre or equator of the cell
=

Question 4

What happens in anaphase?

Answer 4

= centromere’s divide in 2
= spindle fibres shorten
= pulls sister chromatids at opposite poles
=

Question 5

What happens in telophase?

Answer 5

= chromatids have reached the poles of the cells (chromosomes)
= spindle apparatus breaks down
= nucleur membranes reform
= chromosomes uncoil back to their chromatin state
= nucleous repears in each nucleus
=

Question 6

What happens in cytokenesis?

Answer 6

= central cell membrane is pulled inwards by the cytoskeleton
= creates a groove that gradually deepends
= membranes fuse to form 2 independant cells

Question 7

What is the mitotic index?

Answer 7

= number of cells in mitosis
/ totoal number of cells
x 100