GPEE: Speciation

Question 1

What is allopatric speciation?

Answer 1

Speciation due to geographical isolation

Question 2

What is sympatric speciation?

Answer 2

Speciation due to variation in fertilisation or courtship behaviour.

Question 3

Briefly the process of speciation:

Answer 3

• Reproductive isolation means no gene flow can occur.
• Genetic mutation in DNA base sequence causes variation
• Those with advantageous allele are more likely to survive and reproduce.
• Allele frequency increases over many generations
• Different species cannot breed to produce fertile offspring.

Question 4

Genetic drift causes changes in allele frequency due to _____.

Answer 4

Chance

Question 5

What is genetic drift?

Answer 5

When random chance (rather than natural selection) causes a population’s allele frequency to change