Principal of natural selection

Principal of natural selection
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  • Genetic Variation
  • Over production and struggle to survive
  • Differential Survival and reproduction
  • In the ocean, there is a population of fishes. Some fishes are smaller and some are bigger.
  • Changes in gene pool
  • The big fishes are struggling to survive because they are getting eaten by sharks.The smaller fishes are too small for a shark to see and eat.
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  • Only the smaller fishes are going to survive and will pass those genes onto the next generation.
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  • Since the smaller fishes are not getting eaten by sharks, the bigger fishes were struggling to survive, the gene pool in the population will produce more smaller fishes.
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