Natural Selection/ Artificial Selection

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Natural Selection (1)

  • Genetic information is passed from a parent to their offspring.
  • Sometimes small errors occur in this process, causing a mutation
  • This means that there will always be variation within a population. For example, humans all belong to one species but they are not all exactly the same; some are taller, slimmer, have different eye colours etc.
  • The environment changes over time, so some species may have to adapt to suit their new environment. For example the peppered moth changed colour during the industrial revolution to blend in with the smoke and dull colours.
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Natural Selection (2)

  • The individuals that change to fit in with their environment will breed, passing this new feature to their offspring. These individuals are more likely to survive, as will their offspring.
  • This process is called natural selection.
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Artificial Selection/ Selective Breeding (1)

  • This breeding takes place by creating offspring from your best animals to suit for a certain characteristic you adore.
  • For Example Selective Breeding in animals:
  • if you wanted to produce cows that produced alot of milk, you would select the two greatest from your pack and let these reproduce
  • Then chose from the F1 generation the best two again. let these reproduce to produce even better offspring (F2 Generation). This will go on and on until you find the perfect animal with the characteristics you aspired.
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Artificial Selection/ Selective Breeding (2)

  • You may reproduce animals to gain these certain characteristics- cattle which produce alot of meat-plants which produce lots of fruit-crops which are resistant to certain disease
  • For example Selective Breeding in plants:
  • if we wanted to produce plants that give high yield, repellent from disease and harsh weather.
  • grow plants
  • Plants which have short stalks and large heads of grain are selected
  • these cross to produce a new generation
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Artificial Selection/ Selective Breeding (3)

  • the better plants are selected and breed, then eventually all the plants will have short stalks and big heads of grain
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