Chapter 6.2

Question 1

What are the 4 stages of mitosis?

Answer 1

Prophase

Metaphase

Anaphase

Telophase

Question 2

What happens during prophase?

Answer 2

1) During prophase the chromosomes are moved by the spindle fibres to form a plane the centre of the cell called metaphase plate and held in the position

Question 3

What is the structure of chromatin fibres like?

Answer 3

Made up various proteins, RNA, DNA.

Question 4

What happens during metaphase?

Answer 4

1) During metaphase the chromosomes are moved by the spindle fibres to form a plane the centre of the cell called metaphase plate and held in the position

Question 5

What happens during Anaphase?

Answer 5

1) Chromatin fibres begin to coil and condense to form chromosomes. The nucleolus disappears and the nuclear membrane breaks down
2) Protein microtubules the form spindle shaped structures which then link the poles of the cell => These fibres form spindle that is necessary to move the chromosomes into the correct position before division
3) In animal/plant cell - two centrosomes migrate to the same poles of the cell and the centrosomes are cylindrical bundles of proteins that help the function of the spindle
4) Spindle fibres then attach to specific areas on the centromeres and start to move the chromosomes to the centre of the cell

5) By the end of anaphase the nuclear envelope has disappeared.
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Question 6

What is cytokenesis?

Answer 6

Is the actual division of the chromosome into two separate cells during telophase

Question 7

What happens during Telophase?

Answer 7

1) When chromatids reached the poles they now known as chromosomes -the two new sets of chromosome assemble at each poles and a nuclear envelope reforms around them
2) Chromosome start to uncoil and the nucleolus is formed.