Tue February 08, 2011 By: Somya Pandey

Depending on the nature of variations, different individuals would have different kinds of advantages. explain.

Expert Reply
Sat February 12, 2011
Dear student,
Variations present in organisms help them to survive in nature. The variations vary in different organisms.
all these variations in a species do not have equal chances of surviving in the environment in which they find themselves. The different variations confer different advantages to different individuals. For example bacteria that can withstand heat will survive better in a heat wave. Also green colured beetles will be protected from predators among a bush than red coloured beetles. So in these cases, the different variations present in organisms help them to survive.

One of the best examples to explain this is:

Initially in England, before the industrial revolution, the tree trunks were not blackened and the lighter colored moths were present in higher frequencies. However, during the period when the number of coal-burning factories in England began increasing it was noticed that the tree trunks became blackened. So the number of melanic individuals of the species of Peppered Moth was becoming more common. Originally rare in the population of normally light-colored moths, the frequency of the melanic form increased in polluted areas until it was over 90%. The change was presumed to be a result of natural selection since the melanic moths in polluted areas better matched the blackened tree trunks where they rested during the day. In unpolluted forests distant from industrial centers the lighter colored moths were present in higher frequencies.


Regards, Team Topperlearning

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