Mitosis

Question 1

What are the 4 stages of mitosis

Answer 1

• Prophase
• metaphase
• anaphase
• telophase

Question 2

What part of the cell cycle is mitosis

Answer 2

Cell division

Question 3

Describe what happens at stage 1 of mitosis

Answer 3

Prophase
- chromosomes condense and are therefore visible
- centrioles move to opposite poles and create spindle fibres which develop int the spindle apparatus
- the nuclear envelope breaks down and the nucleolus disappears

Question 4

What happens at stage 2 of mitosis

Answer 4

Metaphase
- chromosomes align along the equator
-spindle fibres relied from each pole attach to each sister chromatids

Question 5

What happens a stage 3 of mitosis

Answer 5

Anaphase
- spindle fibres retract and pull sister chromatids to opposite poles
- this causes centromere to divide into 2
- chromatids are pulled to opposite poles
- requires ATP

Question 6

What is stage 4 of mitosis

Answer 6

Telophase
- chromosomes reach the poles
- nucleus reforms
- spindle fibres disintegrate

Question 7

What is the mitotic index

Answer 7

% of cells undergoing mitosis

Question 8

What is the word equation for mitotic index

Answer 8

Mitotic index = the number of cells in mitosis / the total number of cells x 100