Evolution

Question 1

What is darwins theory of natural selection

Answer 1

1. In a species all the individuals are different and show a wide range of variation
2. This variation is due to differences in their genes ( due to continous mutations)
3. Individuals with charateristics most suited to their environment have an advantage and are more likely to survive
4. The genes and alleles that allow these individuals to be successful are passed down to their offspring .

Question 2

What is a species

Answer 2

A species is a group of similar organsims capable of interbreeding to produce fertile offspring

Question 3

How does speciation occur

Answer 3

1. A population becomes geographically isolated from an original population
2. There are different environmental conditions in the new population
3. Mutations in the genes may occur,creating variation in the population
4. Natural selection occurs ,whereby organsims, that have advanteous alleles for this environment survive and reproduce
5. The new population eventually changes to the point where it can no longer interbreed with the old population
6. speciation has occured