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- In populations subjected to high levels of predation a. individuals should invest little in reproduction so as to maximize their survival. b. individuals should produce few offspring and invest little in any of them. c. individuals should invest greatly in reproduction because their chance of surviving to another breeding season is low. d. individuals should stop reproducing altogether.Species that have many offspring at one time are usually: a. r-selected b. K-selected c. both r- and K-selected d. not selectedFecundity is defined as the number of offspring produced pera. mating.b. brood.c. year.d. individual.
- Which reproductive isolating mechanism(s) might be operating in each situation? There may be more than one possible answer for each. a.Different species of songbirds inhabit the same forest yet do not interbreed. b.Salmon and trout populations breed in the same streams in British Columbia, during the same period. c.A gardener has two closely related plant species. One blooms in the summer; while the other blooms in the spring.Behavioral isolation is considered which type of reproductive barrier? a prezygotic b postzygotic c overlapping d heritableWhat factors influence gene flow between populations?A. The home range size of the species.B. Differences in animal behavior and life history strategies can form effective barriers to gene flow.C. Barriers to gene flow between populations are always physical geographic barriers.D. Reproductive barriers must involved anatomical differences that prevent mating.
- EVOLUTION CONNECTION Contrast the selective pressuresoperating in high-density populations (those near the carryingcapacity, K) versus low-density populations.Describe two mechanisms that can decrease gene flowin sympatric populations, thereby making sympatricspeciation more likely to occur.What is the effective population size of an island population of parrotsconsisting of 30 males and 30 females, in which only 10 of the malesbreed?a. 10 b. 20 c. 30 e. 60 d. 40
- Which situation is not an example of a prezygotic barrier? a. Two species of turtles breed at different times of the year. b. Two species of flowers attract different pollinators. c. Two species of birds display different mating dances. d. Two species of insects produce infertile offspring.Which of the following is associated with the reproductive potential of a species? a. few offspring b. many offspring c. semelparity d. fecundityExplain below term is true or not ? "Proportion of total phenotypic variation in a population thatis due to genetic factors"