Name: Genetic Recombination and Gene Mapping
Uploaded: 2019-07-19
Duration: 9 min 49 s
Description: Thomas Hunt Morgan and Alfred Sturtevant used the fruit fly to develop a theory of chromosomal inheritance and discover crossing over. Watch this video.

Question

What is industrial melanism? Discuss different types of selection with proper illustration.

Accepted Answer

Around the time of the industrial revolution, industrial melanism was first noticed in the United Kingdom. Peppered moth species that were light grey were more common before the industrial revolution. They managed to dodge predators like birds by blending in with their surroundings.

The three types of Natural Selection are:

Stabilizing Selection-When the population settles on a certain trait value, stabilizing selection occurs, and genetic variation diminishes.

Directional Selection-Selection for a certain extreme trait in a population over other traits.

Disruptive Selection. Diversifying selection, also known as extreme selection, explains population genetic changes in which extreme levels of a characteristic are preferred over intermediate ones.

What is industrial melanism? Discuss different types of selection with proper illustration.

Important Questions on Mechanism of Evolution

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