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By: Kyle Raven, Zach Christensen, and Derek Willden
A simple way to remeber Disruptive selection is imagine it as a new destructive force being placed on the common species so it has to divide into its extremities.
In Lobster males there are mainly two types. There are the Alpha males that obtain mates by brute force and the smaller ones who obtain mates by sneaking in when the Alpha is distracted. Yet medium-sized lobsters would not have their traits selected due to the fact that they are too small to overpower the females and too large to sneak in. So only large and small are able to pass on their traits.
Peppered moths are an example of diversifying selection. It was most common before the industrial era to have black and white moths. Yet, with the pollution given the birch trees turned black allowing the normally recessive black moths to thrive. And the white moths could survive in the non-polluted country side so it was that the two normally recessive traits became dominant in the species.
This is when nature picks the extremes of a species to fit the surrounding area so they can survive. It often results in the creation of two separate species.
By: Kyle Raven, Zach Christensen,
and Derek Willden