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Natural Selection

Natural Selection. BY: Maddy Alonzi and Molly Seymour. Step 1. There are variations of a species, these giraffes for example. One is tall, and can reach the tree which is good for the survival of the species. The other is short, and cannot reach the tree. . Step 2.

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Natural Selection

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  1. Natural Selection BY: MaddyAlonzi and Molly Seymour

  2. Step 1 There are variations of a species, these giraffes for example. One is tall, and can reach the tree which is good for the survival of the species. The other is short, and cannot reach the tree.

  3. Step 2 Because the short variation cannot reach the food source, it dies off. The tall variation can reach the food source, so it lives.

  4. Step 3 The tall variation finds a mate and re-populates.

  5. Step 4 The tall variation eventually becomes the only variation in the species, completely eliminating the short variation.

  6. Theory of Natural Selection: • It is a mechanism for change in populations. It is when helpful variations beat out unhelpful varations.

  7. Terms: • Mutations: cause different traits to show up. The traits are passed on. • Helpful Variations: traits that help the species and better its chances of survival and reproduction. • Environmental Pressure: anything that puts pressure on/threatens a species survival

  8. Adaptations vs. Variations • An adaption is one that is in every member of that species. • An variation is only in a few members of the species.

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