3.2.2 - Mitosis

Question 1

Describe Mitosis?
(3 Points)

Answer 1

~ Comes after interphase.

~ PMAT.

~ Process of nuclear division in which 2 genetically identical daughter nuclei are produced.

Question 2

What Is Mitosis Needed For?
(3 Points)

Answer 2

~ Growth of multicellular organisms.

~ Repairing damaged tissues.

~ Asexual reproduction.

Question 3

What Are The 4 Stages Of Mitosis?
(5 Points)

Answer 3

~ PMAT.

~ Prophase.

~ Metaphase.

~ Anaphase.

~ Telophase.

Question 4

Describe Prophase
(5 Points)

Answer 4

~ Chromosomes condense and become visible in the nucleus when stained.

~ Nucleolus disappears and the nuclear membrane starts to break down.

~ Sister chromatids are joined at the centromere.

~ The 2 centrosomes move towards opposite poles.

~ Proteins begin to form spindle fibres.

Question 5

Describe Metaphase
(2 Points)

Answer 5

~ Spindle apparatus has completely formed.

~ Chromosomes are lined up at the centre or equator of the cell.

Question 6

Describe Anaphase
(4 Points)

Answer 6

~ Sister chromatids separate at the centromere.

~ Centromeres divide into two.

~ Spindle fibres begin to shorten.

~ The separated sister chromatids are pulled to opposite poles by spindle fibres.

Question 7

Describe Telophase
(6 Points)

Answer 7

~ Chromatids are referred to as chromosomes again.

~ Chromosomes arrive at opposite poles and begin to decondense.

~ Spindle apparatus breaks down.

~ Nuclear envelopes reform around each set of chromosomes.

~ Chromosomes uncoil back to their chromatin state.

~ Nucleolus reappears in each nucleus.