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test review 2 questions

test review 2 questions - 1 a population is a group of...

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1. a population is a group of individuals of a single species inhabiting a specific area; individuals that do interbreed; common gene pool, population attributes may vary between species. A species is individuals that can be interbred. 2. gene pool- sum of all genetic information in all individuals in a population. Get outside influence or close the population 3. common garden- used to demonstrate which characters have a genetic basis: are differences maintained? Reciprocal transplant and switching experiments- evaluate adaptive significance of trait response 4. small population size increases the probability that allele frequencies will change from one generation to the next due to chance alone. Change in frequencies due to chance or random events is called genetic drift. Genetic drift reduces genetic variation in populations over time by increasing the frequency of some alleles or eliminating others 5. no it cannot according to the Hardy-Weinberg equation 6. gene flow can limit evolution because allele frequencies may decrease in a population that is closed or of small size. This causes selection of certain trait overtime and makes it more uniform among individuals. Decreasing allele frequencies causes the population to be less adapt to changes in the environment and limits the change in the population. 7. 8. stabilizing selection- acts against extreme phenotypes and as a consequence favors the average phenotype. Directional selection- favors an extreme phenotype over other phenotypes in the population Disruptive selection- favors two or more extreme phenotypes over the average phenotype in a population 9. beak length of bugs reared on different species but from the same population maintained beak size showing this trait had a genetic basis that most likely had evolved. This shows signs of adaptive evolution 10. it would seem dogs separated from wolves much earlier than the domestication of dogs. Separation 100,000 domestication about 10,000
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11.10 successive generations is the result of nearly 50 years of experiments in the Soviet Union and Russia to domesticate the silver morph of the red fox . The breeding project was set up in the 1950s by the Soviet scientist Dmitri Belyaev . As a result of selective breeding , the new foxes not only have become tamer , but more dog -like as well.The domesticated foxes exhibit both
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