3. 2. 2 - Natural selection in action Flashcards

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1
Q

what is the selection pressure?

A

the pressure exerted by a changed environment or niche on individuals in a population, causing changes in the population as a result of natural selection

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2
Q

what is industrial melanism?

A

the evolution of dark-coloured individuals in a habitat that has been made darker by industrial pollution (e.g soot)

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3
Q

what is selecting for reproductive success?

A

when natural selection operates on adaptations that are specifically used when attracting a mate
- e.g: tail of a peacock and adaptations of pollinated flowers that help attract pollinators to the plant

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4
Q

what is a directional selection?

A

natural selection showing a change from one dominant phenotype to another in response to a change in the environment

  • one phenotype is selected for over all the others
  • it occurs anywhere that environmental pressure is applied to a population
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5
Q

define gene pool

A

all of the alleles of all the genes in a population

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