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- One concept of conservation biology is known as minimum viablepopulation. Some species’ populations are so fragmented andsmall that they may have very little genetic variability left. Withminimal genetic variation in the population, there is little likelihoodthat a population can adapt to an environmental threat, such as anew disease. Florida panthers are at or below the minimum viablepopulation level (estimated population less than 80). 1)Do you think that it is practical to use limited resources toconserve a population like the Florida panther? 2)Why?The long-leaf pine forest ecosystem once extended across 95 million acres of the southeastern US. However only 5 million acres now remain causing major declines in the Gopher tortoise population. Given this, what is expected to happen to overall diversity of species that depend on Gopher Tortoise burrows?a. increaseb. decreasec. stay the sameMatch the description with the correct term.A. the idea that inherent variation in a population allows for certain traits to be selected and carried on to future generations of the population experiencing an environmental pressureB.organisms that do not have a common ancestry but develop body parts that perform the same functionC. a model suggesting the gradual change of a species to form distinct speciesD. the idea that all living things on Earth share a common ancestorE. a common ancestor adapts and results in various speciesF. two populations become reproductively isolated (can no longer reproduce successfully)1.speciation 2. adaptive radiation 3. analogous structures 4.theory of evolution 5. gradualism 6. theory of natural selection
- Males of different species of the fruit fly Drosophilathat live in the same parts of the Hawaiian Islandshave different elaborate courtship rituals. These rituals involvefighting other males and making stylized movements thatattract females. What type of reproductive isolation does thisrepresent?(A) habitat isolation(B) temporal isolation(C) behavioral isolation(D) gametic isolationDiscuss criteria or measurements by whichyou might conclude that a population is betteradapted after a certain evolutionary change thanbefore______________is/are defined as a group of potentially breeding organisms within a species ina given space and time.a.Densityb.Populationsc.Distributiond.Abundancee.Community
- Natural selection tends to work toward genetic unity;the genotypes that are most fit produce the mostoffspring and increase the frequency of adaptive allelesin the population. Yet there remains a great deal ofvariability within the populations of species. Describethe factors that contribute to this genetic variability. Provide the link of referencesCana a change in the physical enviroment of a population result in evolution by natural slection?(hint: remember the peppered moth's camouflage and color changes of tree bark due to pollution)Polar bears live on the ice cap near the North Pole. Their numbers aredwindling, apparently because of both pollution and global climatechange. List some specific ways that the melting of the Arctic ice capmight affect polar bear populations.
- Consider the following scenario. A large population of lizards occupies an extensive range that is relatively uniform ecologically (i.e., in terms of climate and co-occurring species). At a certain point in time, the ancestral population becomes divided down the middle into two similar-sized portions by a barrier that completely prevents the movement of lizards between the descendant populations. Around the same time, a major flood occurs, and a small number of individuals have swept away from the mainland on floating debris and arrive alive on a small offshore island that has no lizards of this species. The habitat on the island is similar to their homeland, but not identical (the climate is slightly different, many mainland species of plants and animals are absent, and a few island species of plants and animals are different from any present on the mainland. Thus, there are now three separate populations. Compare and contrast the expected evolutionary consequences for these…Mountain gorillas are a highly endangered primate species, with 800 or so individuals surviving in the two remaining populations. A recent sampling of mountain gorilla genomes revealed a very low level of genetic diversity. Explain why a decline in genetic diversity often accompanies a decline in population size.Suppose that females of one population of strawberry poisondart frogs (Dendrobates pumilio) prefer to mate with males thatare orange-red in color. In a different population, females prefermales with yellow skin. Explain how such differences could ariseand how they could affect the evolution of reproductive isolation in allopatric versus sympatric populations.