Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What was Lamarck's theory?
   • Lamarck's theory was that changes in an organism only occur during its lifetime and are then inhertted.
2. What was the impact of Darwin and Wallace's ideas?
   • Darwin and Wallace's ideas lead to the realisation that life on earth evolved from a common organism eventually branching off into different species and families.
3. Who was Alfred Russell Wallace and how is he linked to Charles Darwin?
   • Alfred Russel Wallace independently proposed the theory of evolution by natural selection. He published joint writings with Darwin in 1858 which prompted Darwin to publish On the Origin of Species (1859) the following year.
4. What is Wallace best known for?
   • Wallace worked worldwide gathering evidence for evolutionary theory. He is best known for his work on warning colouration in animals and his theory of speciation.
5. What was needed to support Alfred Wallace's work in order to lead to our current understanding of the theory of speciation?
   • Alfred Wallace did much pioneering work on speciation but more evidence over time has led to our current understanding of the theory of speciation.
6. In what ways do new species arise? How are these described?
   • New species can arise as a result of: Isolation - where two species become geographically separated each evolving in such a way that they can no longer breed. Oenetic variation - where each population has a wide range of alleles that control their characteristics Natural selection - where the alleles which help an organism to survive are selected in each population Speciation - where the populations become so different that successful interbreeding cannot happen anymore