Chapter 12

Question 1

Define Mutation

Answer 1

a mutation when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene

Question 2

Define Mutagen

Answer 2

an agent or substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed

Question 3

Give as many examples of Mutagens (at least 4)

Answer 3

• mustard gas
• sulphur dioxide
• formaldehyde
• x-rays
• cosmic rays
• radiation

Question 4

Define Mutant

Answer 4

resulting from or showing the effect of mutation

Question 5

What are the 2 types of mutations?

Answer 5

Gene Mutations

Chromosomal Mutations

Question 6

Which is the type of mutation which changes occur only in a single gene?

Answer 6

Gene Mutations

Question 7

When does Gene Mutations occur?

Answer 7

During replication of the DNA before cell division

Question 8

What happens if a mistake occurs when the DNA is being copied?

Answer 8

Changes will have a huge affect on the characteristic

Question 9

Define chromsomal mutation

Answer 9

all parts of a chromosome are affected