Mitosis

Question 1

What is mitosis used for? (3)

Answer 1

• Growth
• Repair
• Reproduction of unicellular asexual organisms (binary fission)

Question 2

How is a chromosome structured? (2)

Answer 2

• Converted into chromatids

- Joined at the centromere

Question 3

What happens at prophase? (3)

Answer 3

• Chromatin fibres coil and condense to form chromosomes
• Centrioles move to the poles
• Spindle fibres form

Question 4

What happens at metaphase? (2)

Answer 4

• Chromosomes moved by spindle fibres

- Forms the metaphase plate

Question 5

What happens at anaphase? (3)

Answer 5

• Centromeres divide
• Chromatids separated
• Chromatids pulled to opposite poles of the cells by shortening spindle fibres

Question 6

What happens at telophase?

Answer 6

• Chromatids into chromosomes

- Nuclear envelope and nucleus reforms

Question 7

What’s the difference between mitosis and cytokinesis?

Answer 7

Mitosis - nucleus divides

Cytokinesis - cytoplasm divides and two cells are produced

Question 8

How is cytokinesis in animals? (2)

Answer 8

• Cytoskeleton pills the membrane inwards

- Cleavage furrow

Question 9

How is cytokinesis in plants? (4)

Answer 9

• Cleavage furrow can’t form due to cell wall
• Vesicles assemble in metaphase plate
• They fuse and divide into two
• New sections of cell wall form before separated