1. How do the authors of this page define microevolution?
A-Microevolution is evolution on a small scale—within a single population. That means narrowing focus to one branch of the tree of life.
2. How do they define a population?
A-It is a group of organisms that interbreed with each other and they all share a gene pool.
3. Summarize each of the 4 mechanisms of microevolutionary change that are discussed.
A-Mutation; Is when some “green genes” randomly mutated to “brown genes”.
Migration; Beetles with brown genes immigrated from another population, or some beetles carrying green genes emigrated.
Genetic drift; When the beetles reproduced, randomly more brown genes than green genes ended up in the offspring.
Natural selection; The green gene beetles get easily eaten then the brown beetles. The brown beetles go to the next generation.
4. Summarize the 3 examples of microevolution on this page
A-The Size of the Sparrow;
The differences are genetically based, they almost certainly represent microevolutionary change: populations descended from the same ancestral population have different gene frequencies.
Coping with Global Warming;
There is many human-induced changes in the environment, Mosquito populations have evolved so that slightly shorter days are required as a cue for going dormant.
Building Resistance;
The enterococci bacteria, have evolved a resistance to several kinds of antibiotics
5. Summarize the results of the two different experiments (with and without predators).
A-The course gravel with the predator present then fewer than 15 generations of sections the spots got darker and blended it in. The fine gravel with the predator present then fewer than the 15 generations of sections, the spots got lighter and blended in with its surroundings. The course gravel with no predator changed and the fishes had dark spots even though it had a light surrounding and the fine gravel with no predator had light spots when it has a dark background.
6. What types of selection were demonstrated in each experiment? Are these experiments truly cases of artificial selection? Explain your answer.
A-The types of selection is artificial selection because it is the domestication of plants and animals. They are using artificial selection because they are manipulate the spots on guppies.
7. Pick your three favorite questions from the quiz and write how you would answer them if you were teaching this class.
A-"What is the big deal about artificial selection?"
How I would answer this is by saying that artificial selection is an interesting miniature model of what has happened in the evolution of life on Earth.”
"How can gene frequency change?
A-Humans have the same number of genes but frequency genes are the number of different sorts of gene variants in a population. So it might start of with the coding for green eyes, then the next time it will be brown eyes.
"How can microevolution happen?"
A-Microevolution can result from mutation, a spontaneous change in DNA; or migration, genes coming into the population from elsewhere; or genetic drift, random selection for a particular gene.
Use the simulation to test different hypotheses about why some guppies are very brightly colored even though that makes them easy for predators to find.
1. Why do some guppies tend to be drabber than others?
A-The guppies are on different parts in the same stream.
2.Why do some guppies tend to be more colorful?
A-In different stream locations.
3
.What role does color play in guppy survival?
A-They blend in so their predators don't find them.
4. Explain the push and pull that the environment (including predators) has on the coloration of guppies in Endler’s pools.
A-Predators influence the evalution of a population of guppies, but it takes generations of time.
No comments:
Post a Comment