Topic 4- stabilizing and directional selection Flashcards
1
Q
What is stabilising slection?
A
natural selection that keeps allele frequencies relatively constant over generations
2
Q
What does stabilising selection result in?
A
things stay as they are unless there is a change in the environment
3
Q
Give an example of stabilisng selection
A
Human birth weight
4
Q
What is directional selection?
A
natural selection that produces a gradual change in allele frequencies over several generations
5
Q
Why does directional selection usually occur?
A
when there is a change in environment/selection pressures or a new allele has appeared in the population that is advantageous
