Summing up Adaptation:
There are three things that make natural selection and adaptation happen:
1) Genetic variability in a population, so that a trait appears that can give an advantage.
2) The trait must be inheritable so it can be passed on to the offspring.
3) The trait must lead to more offspring surviving so it will eventually spread throughout the population. This is called differential reproduction.
Adaptation Discussion Questions:
1. Can you think of other examples of traits that would give the caribou an advantage, so would be considered adaptive traits?
2. All living things have adaptive traits. Name five living things, one adaptive trait that you can see and how it helps them survive. For example, a grasshopper is greenish-brown so it blends into the grass on which it feeds (adaptive trait). This helps it hide from birds that might prey on it.
3. Why does it take many, many generations for an adaptive trait to spread throughout the whole population?
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