What are some examples of directional selection?
1 Answer
The example of directional selection is Industrial Melanism ,Darwin finches.
Explanation:
Natural selection has three effects from which directional selection is one .The other two are Stabilisation selection and Disruption selection.
It is one of the factors that affect Hardy-Weinberg Principle.
In directional selection larger no. of individuals acquire value other than mean character value, so peap of graph shifts in one direction.
Example - Industrial Melanism.
What is Industrial Melanism ?
- In England, before industrialisation, white-winged moth were more in no. than dark-winged moths.
- But after industrialization, dark-winged moths became more in no. than white winged moths.
- This is bcz during industrialization, the tree trunks covered by white lichen became dark due to deposition of coal & dust particles.
- As a result, white-winged moths can be easily picked up by predators from the dark background & dark-winged moths survived.
The graph below is showing directional selection with Industrial Melanism.
