Explain variation by taking beetles as an example
Answers
There is variation in traits.
For example, some beetles are green and some are brown.
Color variation in these beetles
There is differential reproduction.
Since the environment can't support unlimited population growth, not all individuals get to reproduce to their full potential. In this example, green beetles tend to get eaten by birds and survive to reproduce less often than brown beetles do.
Differential reproduction
There is heredity.
The surviving brown beetles have brown baby beetles because this trait has a genetic basis.
Heredity of the traits of the beetles who survive
End result:
The more advantageous trait, brown coloration, which allows the beetle to have more offspring, becomes more common in the population. If this process continues, eventually, all individuals in the population will be brown.
HEYA MATE :)
variations develop during reproduction in organisms.
sexual reproduction and errors in DNA copying leads to variations in offsprings in a population
Example ::
in this situation a colour variatio arises during reproduction. So that there appears one beetle that is green instead of red. Moreover, this green beetle passes its colour to its offspring. So that all its progeny are green. Crows can't see the green beetles on green leaves of the bushes and therefore crows can't eat them. But crows can see red beetles and eat them. As a result there are more and more green beetles than red ones which decrease in number.
the variation of colour in beetle 'green' gave a survival advantage to green beetles than red beetles. in other words it was naturally selected. We can see that natural selection was exerted by the crows....
the more crows there are, the more red beetles would be eaten and the more number of green beetles in the population would be...
thus the natural selection is directing evolution in the beetle population
WISH IT helps !!
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