Natural selection

Question 1

Explain how variation leads to adaptation?

Answer 1

• Variation can be caused by random mutations, this leads to varied phenotype.
• Selection pressures increase the chance of certain organisms surviving
• SP includes predation, disease or competition

Question 2

Explain how natural selection leads to evolution

Answer 2

• Only a specific phenotype will survive and reproduce
• Advantageous alleles increase over generations
• Those that are not well adapted die out
• The beneficial alleles become dominant over time
• The species has evolved

EG- The white moths became dark in colour due to the industrial revolution