What are some examples of directional selection?

1 Answer
Jan 24, 2018

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.

https://www.slideshare.net/NickHardwood/types-of-selection

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.

https://courses.lumenlearning.com/boundless-biology/chapter/adaptive-evolution/

http://slideplayer.com/slide/2368631/