Mitosis

Question 1

Why do organisms do mitosis?

Answer 1

1 - Asexual reproduction
2- Growth
3- Tissue repair

Question 2

Describe Prophase

Answer 2

-Chromosomes condense and first become visible
- Centrioles move to poles
- Spindle fibres develop
-Nuclear envelope breaks down and nucleolus disappears

Question 3

Describe Metaphase

Answer 3

-Chromosomes seen to be made up of 2 chromatids
- Chromatids joined by the centromere
- Chromosomes pulled by spindle apparatus and begin to arrange themselves across equator of cell

Question 4

Describe Anaphase

Answer 4

-Centromeres divide in 2 and spindle fibres pull the individual chromatids apart
- Chromatids move to opposite poles
- Energy provided by Mitochondria

Question 5

Describe Telophase

Answer 5

• Chromosomes reach poles
• Become indistinct
• Nuclear envelope reforms, Nucleolus reforms
• Spindle disintegrates

Question 6

What happens at Cytokensis?

Answer 6

Cell wall divides

Question 7

Why do we use Hydrochloric Acid in the Mitosis practical

Answer 7

Acid softens and loosens root tissues, so cells can be squashed

Question 8

Why do we stain the cells?

Answer 8

To make the chromosomes visible

Question 9

Why do we squash cells?

Answer 9

To make it one cell thick so light can pass through when viewing from a microscope

Question 10

Why do we use a mounted needle?

Answer 10

To lower the cover slip and prevent air bubbles under the cover slip