B2.1.4

Question 1

Why does mitosis occur

Answer 1

Where body cells divide to replace worn out cells to repair damaged tissue and to allow for growth.

Question 2

What is mitosis

Answer 2

mitosis is the process by which each cell divides to form two genetically identical daughter cells

Question 3

How is DNA replicated

Answer 3

Cell copies its chromosomes so the new cells produced will have a complete set of genetic material.

Question 4

What is DNA replication

Answer 4

DNA unzips forming two separate strands
DNA bases on each strand are exposed
Free nucleotides in the nucleus line up against each of the strands forming complementary base pairs
This forms DNA base pairs
Whole strand complete there are two identical molecules of DNA

Question 5

Movement of chromosomes

Answer 5

Chromosomes line up across the centre of the cell.
identical copies of each chromosome, formed when DNA replicated, separate and move to opposite ends of the cell.
Each end now contains a full set of identical chromosomes.
Two new nuclei then forms

Question 6

What is the last stage mitosis

Answer 6

The cell then pinches inwards to separate the two new nuclei and splits the cell into two genetically identical daughter cells.

Question 7

What are the stages of the cell cycle

Answer 7

Cell growth -> synthesis (DNA replication) -> cell growth -> mitosis -> cytokinesis.