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Exam 1 Key bio
| Question | Answer |
|---|---|
| would birds with deep beaks survive the drought more often than birds with more slender beaks? | yes because the availability of food changes. small, soft seeds are quickly consumed, only large and hard seeds left. |
| how would mean beak-depth of finches in the population in the following generation (post-drought) compare to the mean beak-depth of the parental population (pre-drought)? | the mean beak depth of birds in the following generation would not change given there's no heritability |
| difference in male body size in normal vs. el nino years | normal: sexual selection favors large males that can maintain territories. body size of males/females don't change that much el nino: largest males lose body mass, natural selection acts against large males and shifts the body size of the male pop. down |
| 2 disadvantages of living in social groups | 1) increased conspicuous to predators 2) disease transmission is higher in groups |
| for a gene that has 12 alleles, what is the maximum number of alleles one human could have? | 2 |
| compare and contrast indirect fitness and inclusive fitness | inclusive fitness: number of gene copies passed through direct descendants and relatives (direct & indirect fitness) indirect fitness: number of gene copies passed through relatives |
| compare and contrast genetic drift and founder effect | genetic drift: change in allele frequency between generations due to chance events and is amplified as population size decreases founder effect: one/few individuals start a new population. both result in changes in allele frequencies |
| compare and contrast common garden experiment and cross fostering experiment | common garden: plants grown in the same location so that all individuals experience identical environments (any variation of a trait will be the heritable component) cross fostering: translocating offspring to be raised by parents with different phenotyp |
| what is the major disadvantage of using common names, instead of scientific names for organisms? | same common name is often used by different groups of people to refer to different species. scientific names are unique to one species |
| if exposure to massive amounts of sun caused a tumor to develop on the arm of your TA, is this a phenotype and can natural selection act on it? | yes it's a phenotype. no, it will not be passed to the next generation because it is somatic, not germline. |
| why do biologists speak of "evolutionary theory" if the facts of evolution are not in doubt? | theory is a guess by some. scientists don't use the word prove b/c theory can be used to describe work that's rigorously tested and well-established facts and principles are used to make predictions. |
| why do the terms primitive and advanced make no sense when talking about organisms and natural selection | organisms are the outcome of changing conditions, natural selection cannot anticipate future conditions so progress isn't possible. Primitive and advanced are value judgements so cannot pertain to life. |
Created by:
madalynes