Ellie.Ginger
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is genetic variation a selection pressure?
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isob08
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No not exactly... Selection pressure leads to genetic variation.

Back to basics; Giraffes with short necks evolved to having long necks - this was so they could reach the leaves on taller trees. The giraffes would have been competing with each other, the ones that adapted to have taller necks were at an advantage as they could reach more available food source.

> Selective pressures determine natural selection - Some members of the population will not survive and reproduce. (short neck giraffes) will not pass on their genes into the next generation. Gradually, the population changes, and genes that improve survival and reproduction will become more common, while genes that are disadvantageous to survival and reproduction will become more rare. This change in the genetic makeup of a population is called evolution.
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Kallisto
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(Original post by Ellie.Ginger)
is genetic variation a selection pressure?
Nope, not really. Selection pressure just determines which living beings survived and which of them not. The living beings which got the better genetic attributes by mutation or genetic recombination are just able to survive better, IF they got. Adaption on surroundings is a passive, not an active evolutionary step! the individuals cannot change their genes by themselves. Genetic variation is a consequence of selection pressure and just the individuals of a population with best fitted genes survive.

isob08 gave a good example above.
Last edited by Kallisto; 2 years ago
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Ellie.Ginger
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Thank you so much isob08 Kallisto
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Kallisto
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#5
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(Original post by Ellie.Ginger)
Thank you so much isob08 Kallisto
Don't mention it, to help people is an honour to me. I am happy to do this, if I can.
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