U3 KA6: Evolution of Species

Question 1

What is a mutation?

Answer 1

• a random change to genetic material.

Question 2

What are mutations a source of?

Answer 2

• new alleles
• can be positive, negative or neutral.

Question 3

What factor can speed up the rate of a mutation?

Answer 3

• radiation.

Question 4

What do mutations allow?

Answer 4

• species to become better adapted to their environment.

Question 5

What does adaptation mean?

Answer 5

• the process of change by which an organism or species becomes better suited to its environment.

Question 6

What is an isolation barrier?

Answer 6

• a barrier that causes a population to be separated so they can no longer interbreed freely.

Question 7

Give 2 examples of a Geographical Isolation Barrier.

Answer 7

• oceans
• mountains

Question 8

What is an Ecological Isolation Barrier?

Answer 8

• when individuals do not interbreed with one another due to differences in their ecological niche.

Question 9

What is a Behavioural Isolation Barrier?

Answer 9

• when individuals do not interbreed due to differences in their behaviours.