Gene Mutations

Question 1

What are gene mutations?

Answer 1

• small, localised changes in the structure of DNA strands

Question 2

What are mutations that involve a single nucleotide called?

Answer 2

• point mutations

Question 3

How can point mutations occur?

Answer 3

• substitution
• insertions
• deletions

Question 4

What is substitution in point mutations?

Answer 4

• where one nucleotide is exchanged for another

Question 5

What are insertions in point mutations?

Answer 5

• where one or more extra nucleotides are added to the DNA molecule

Question 6

What are deletions in point mutations?

Answer 6

• where one or more nucleotides are removed from the DNA molecule