Theories Of Evolution
The first step is variation. It means that in this population there will be some beetles with green colored as well as some with brown colored bodies. Due to the environment, not all beetles will be able to reach their full potential and reproduce themselves. In this case, birds prefer to hunt for the brown beetles, which makes their population decrease and as a result less of them can reproduce. This is also called differential reproduction. The final step is inheritance. Because of the lack of brown beetles, the next generation will tend to have green bodies. The reason behind this is because this trait has a genetic basis. This example shows how common it becomes for this beetle population to develop green bodies. Due to their advantage of not being eaten as much, their offspring become more and more common. If this process continues to happen, all beetles in this population will eventually become green and the brown one’s will become instinct (“Natural Selection”). There is evidence that backs up the example of the beetle population. During the Industrial Revolution, tree trunks became darker due to industrial waste. Light-colored moths that used to camouflage themselves on the trees suddenly became easy prey to birds so they became rare and the dark moth became more common. This evidence shows …show more content…
Because it affects all aspects of an organism’s life such as behavior, appearance, and even its physiology, changes could occur if the DNA modifies. This mutation, however, happen randomly and is not necessarily from great harm. Some of them could be beneficial or even not cause any change. Because mutations are random they do not necessarily matter to evolution. If a mutation occurs in non-reproductive cells, this mutation will not be passed on to future generations.
Using the example of the beetle population, a mutation could allow for some offspring to have a gene for green colored bodies even though the parents have brown bodies. This would help the population for brown colored bodies to decrease.
Migration is another procedure. It is the movement of individuals or an entire group. This enables gene flow because it allows two different populations to converge their genes and therefore unify gene frequencies over a period of time (“Evolution - A-Z -