B14.2 Natural Selection

Question 1

When do scientists first believe life developed on earth ?

Answer 1

Nearly 3 billion years ago

Question 2

What is evolution

Answer 2

The change in the inherited characteristics of a population over time through the process of natural selection

Question 3

Describe the stages of natural selection ? ( 6 stages)

Answer 3

1 Variation within a population due to random genetic mutation
2. Competition then occurs for resources
3. Some traits are better adapted to the surroundings than others other
4. These individuals survive and reproduce
5. They produce offspring that inherit this trait
6. Over generations this trait and therefore alleles become more frequent within the population

Question 4

When do we know a species has become a different species ?

Answer 4

It can breed and make offspring however those offspring will not be fertile