How do the authors of this page define microevolution?
Microevolution is evolution on a small scale—within a single population. That means narrowing our focus to one branch of the tree of life
It is a group of organisms that interbreed with each other—that is, they all share a gene pool.
Summarize each of the 4 mechanisms of microevolutionary change that are discussed.
Mutation- Mutation is very rare but it happens it happens in the genes or DNA. Just like in the beetle pictured the rest are all green and the mutated one is green and brown.
Migration- When the beetles migrate they reproduce with different species so that makes the brown beetles increase in population.
Genetic Drift- When the beetles reproduced, just by random luck more brown genes than green genes ended up in the offspring.
Natural Selection- Beetles with brown genes escaped predation and survived to reproduce more frequently than beetles with green genes, so that more brown genes got into the next generation.
The size of the sparrow- Just talks about how the Sparrow changes over time mostly by natural selection and how the different kinds can survive in different living conditions, its all about survival.
Coping with Global Warming- Different species get used to global warming differently, they each have a technique for example the mosquitoes used to do days according to temperature but now they do it by time.
Building Resistance- Resistance is built by natural selection. For example some people’s bodies have a resistance towards antibiotics.
Summarize the results of the two different experiments (with and without predators).
With predators the males had less of a natural selection because some of the ones that can not blend in were dinner to the predator.
The experiment without the predators had more of a natural selection for the males.
What types of selection were demonstrated in each experiment? Are these experiments truly cases of artificial selection? Explain your answer.
Natural selection. Yes because it has to do with natural selection. Natural selection happens when the male picks and with the predator he had no choice so I think that has to do with artificial selection also.
Pick your three favorite questions from the quiz and write how you would answer them if you were teaching this class.
What’s the big deal about artificial selection?
a. People have a choice to pick what they want with artificial selection they don't want just anything it's what they want.
If I select guppies for colorful fins at home, can I get them to change?
a. Yes it will take time but you can do it by taking the colorful fins that you like and have them reproduce.
Why are house sparrows in North America larger in the North than in the South?
a. Because of the weather change and the different living conditions.
SEX AND THE SINGLE GUPPY!!!
Why do some guppies tend to be drabber than others?
Thanks to predators the guppies colors have varied and have become more drab.
Why do some guppies tend to be more colorful?
Females are choosing to mate with the more colorful males because the stand out.
What role does color play in guppy survival?
The colorful guppies reproduce more.
Explain the push and pull that the environment (including predators) has on the coloration of guppies in Endler’s pools.
The colorful guppies are very weird, they reproduce more because the females are more attracted to them but yet they get targeted by predators because they stand out more to them. The environment change is not much of a challenge for them when it changes they change but over time the more drabby fish can take over too.
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