Bio 182 Study Questions and Answers All Correct

Bio 182 Study Questions and Answers All Correct Male northern elephant seals (Mirounga angustirostris) compete with one another for territories along the beach and defend these territories throughout the breeding season. The males that win the male-male competitions defend the "best" territories and have access to females that stay in that territory of the beach. The females land on the beach during mating season, chose which territory of the beach to join, and then disproportionately breed with the male that defends that area of the beach. At what point may intersexual selection occur in these elephant seals? - Answer-when the female lands on the beach and chooses her resting location A population in biology refers to a group of individuals in the same geographic area that: - Answer-group of same species Genetic drift is the _____ in allele frequencies from generation to generation and is especially influential in _____ populations. - Answer-random change; small Which of the answer choices is an example of stabilizing selection? - Answer- At the genetic level, evolution is: - Answer-A change of part of an organisms genetic sequence or code. How does artificial selection (controlled by a breeder) compare to natural selection? - Answer-It usually is more efficient because it is controlled through breeding and not reproductive success. The half-life of 14C is 5,730 years. Archaeologists dig up a seed that contains 0.25 parts per trillion 14C. If it originally contained 1 part per trillion 14C, how old is the archaeological specimen? - Answer-11,460 years The largest mass extinction occurred at the end of which period? - Answer-Permian Imagine that you are chatting with one of your friends, who stated that reptiles are obviously a monophyletic group, as this group contains all of the organisms (outside of fish) that possess scales. This statement is: - Answer-false, because reptiles are a paraphyletic group; this group does not include birds, even though birds share a common ancestor with reptiles. Which of the character states would be most helpful in identifying sister groups? - Answer-homologous character states that are found in some but not all members of a single group In a particular layer of rock, a number of fossilized ferns are found, but no fossilized mosses. What conclusions can be drawn from this finding? - Answer-The soft tissues of mosses may not have fossilized as readily as the more decay-resistant tissues of ferns, so it is difficult to draw any conclusions from this limited sample.