There are different types of gene mutation.

Put a tick (✓) in the box next to the statement which describes incorrectly the effect of the mutation in an exon of a gene.

☐ A substitution may not result in a change to the encoded amino acid.

☐ An inversion will result in a change in the number of DNA bases.

☐ A deletion will result in a frame shift.

☐ An addition will result in a frame shift.

Describe how alterations to tumour suppressor genes can lead to the development of tumours.

A type of malignant tumour cell divides every 8 hours.

Starting with one of these cells, how many tumour cells will be present after 4 weeks? Assume none of these cells will die.

Give your answer in standard form.

Answer ______________