Speciation

Question 1

Explain how a new species is developed

[5 marks]

Answer 1

1. There is already natural variation in a species due to random mutations
2. A geographical barrier causes populations of the species to become isolated
3. Genetic variation occurs in the isolated populations
4. Natural selection causes different alleles to be favoured on different sides of the barrier
5. Interbreeding to produce fertile offspring is no longer possible and a new species ahs been formed