natural selection Flashcards
1
Q
describe natural selection
A
The process by which a species becomes better adapted to its environment
- Individuals with favourable characteristics have a survival advantage and pass those characteristics on to generations
- Increase the frequency of favorable characteristics
2
Q
what is the first step of natural selection?
A
variation of characteristics within a species
3
Q
what is the second step of natural selection?
A
Selection pressures created by the environment favour some phenotypes over others
4
Q
what is the third step of natural selection?
A
Individuals with advantageous variations survive and pass on their variations to the next generation
5
Q
what is the fourth step of natural selection?
A
Overtime, offspring with certain advantageous variations make up most of the population
6
Q
how does natural selection affect the genetic variation of a population?
A
genetic variation reduces
