Biology: Cartoon Assignment
Storyboard Text
- You're right! The environment increases the frequency of alleles that provide a reproductive advantage to individuals. This results in the evolution of adaptations.
- Yes, I remember reading about natural selection in an article. All I remember from that article was that natural selection is not a random process. But what does that have to do with anything?
- So the pesticide resistant allele was inherited by their offspring. Then the following generations also carried the same allele. This is how the pesticide resistance evolved in the population of the pests. Therefore the frequency of that allele increased in that population and the pesticide spray lost its effectiveness.
- When you first applied a small amount of pesticide spray onto the plants it killed most of the agricultural pests. But the ones that survived probably carried an allele that made them resistant against the pesticide spray. Then the individuals that were resistant against the pesticide survived and reproduced.
- I still don't get what that has to do with the amount of pests increasing in my garden.
- There are three types of natural selection. The evolution of pesticide resistance in that population of pests is an example of directional selection, which is one type of natural selection. Directional selection happens when individuals at one end of the phenotype range have a higher fitness than individuals at the middle and other extreme of the phenotype range.
- Oh that makes sense! I remember reading in that article that there are different types of natural selection. What type of natural selection do you think occurred to the pests in my garden?
- Different selection pressures can cause different types of natural selection. Did you know that the selection pressures can affect the overall fitness and frequencies of phenotypes of a population?
- The meaning of fitness I am referring to is an individual's ability to survive and reproduce in their environment. An individual's adaptations that increase fitness are better at survival and reproduce most successfully in their environment.
- Selection pressure is the different aspects of the environment that select for certain inherited traits of individuals and select against other inherited traits.
- What does selection pressures mean? I've never heard of that term before.
- Wow I never knew that fitness has different meanings!
- Wait a minute. So, the reason for my ruined garden is NATURAL SELECTION!!!
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