Cell Division (meiosis and mitosis)

Question 1

Interphase (mitosis)

Answer 1

• nuclear envelope + nucleolus still present
• chromatin/dna replicated (s phase)
• centrioles doubled (2 of them) (G phase)

Question 2

Prophase (mitosis)

Answer 2

• nuclear envelope/nucleolus breaks down to give more space in the cell for genetic material to move around.
• chromatin/dna has condensed down into chromosomes (replicated chromosomes)
• centrioles have moved to pole of cell to start to make spindle fibres

Question 3

Metaphase (mitosis)

Answer 3

• nuclear envelope/nucleolus still gone
• replicated chromosomes in equator of cell.
• Centrioles have fully formed spindle fibres attached, they attach to centromeres of replicated chromosomes.

Question 4

Anaphase (mitosis)

Answer 4

• nuclear envelope/nucleolus still gone
• replicated chromosomes pulled apart into sister chromatids. Chromosomes form.
• spindle fibres contract and start to break down at the end of the anaphase.

Question 5

Telophase (mitosis)

Answer 5

• nuclear envelope + nucleolus reform. 2 nuclei in 1 cell
• chromosomes decondense to chromatin
• spindle fibres fully break down.

Question 6

Cytokinesis

Answer 6

division of the cytoplasm to form two separate daughter cells