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(A) In natural selection,when more individuals acquire a value other than the mean character value,the population shifts towards one extreme. This is

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Directional change

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(A) In natural selection,when more individuals acquire a value other than the mean character value,the population shifts towards one extreme. This is known as Directional selection or Directional change.$1$. Stabilising selection: Individuals with mean character values are favoured.$2$. Directional selection: Individuals at one extreme of the character range are favoured,causing the mean to shift.$3$. Disruptive selection: Individuals at both extremes of the character range are favoured,leading to two peaks in the distribution.

Natural selection where more individuals acquire specific character value other than the mean character value,leads to:

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Which of the following can be used as an illustration to demonstrate the process of evolution in animals?

Which is the most accepted theory of organic evolution?

$A$: Due to the bottleneck effect,among the survivors,certain alleles may be overrepresented,some may be underrepresented,and some alleles may be totally eliminated.
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