Chromosomes and Mitosis

Question 1

How many chromosomes are there in a human cell?

Answer 1

There are 46 chromosomes. Split into 23 pairs.

Question 2

Explain Mitosis

Answer 2

First, the cell begins to divide. The DNA replicates to form two copies of each chromosome. The nuclear membrane then breaks down and the chromosomes line up across the centre of the cell. One set of chromosomes is pulled to each end of the cell and the nucleus divides. The cytoplasm and cell membranes then divide to form two daughter cells.