Mitosis

Question 1

Interphase

Answer 1

Isn’t a part of mitosis but essential part of cell cycle.
• replication of organelles with their own DNA
• making of new organelles
• increase in cell size
• synthesis of ATP and proteins
• replication of DNA

Question 2

What does mitosis do

Answer 2

Produces cells which are genetically identical to parent cell, to give genetic stability

Question 3

Why does mitosis happen

Answer 3

• growth.
• repairing damages cells
• replace old, worn-out cells
• asexual reproduction

Question 4

What happens if genes which regulate the cell cycle are damages

Answer 4

Uncontrolled mitosis can occur.
This rapid replication of cells can form tumours, leading to cancer.

Question 5

What is cytokinesis

Answer 5

The division of cytoplasm to create 2 genetically identical cells

Question 6

Difference in cytokinesis in plant cells

Answer 6

No centrioles in plant cells.
And a cell plate develops from the centre out, instead of cleavage from outside in like in animal cells

Question 7

Prophase

Answer 7

• chromosomes condense and become visible.
• centrioles moves to opposite sides of cell (in animal cells)
• spindle forms from microtubules.
• nuclear envelope disintegrates

Question 8

Metaphase

Answer 8

Centromeres of chromosomes attach to spindle and line up on equator

Question 9

Anaphase

Answer 9

• spindle fibres shorten.
• centromere separates and individual chromatids pulled to poles, centromere first

Question 10

Telophase

Answer 10

• spindle breaks down
• chromosomes uncoil
• nuclear envelope reforms