Reduced hybrid fertility - Even if the hybrid offspring are vigorous, the hybrids may be infertile and the hybrid cannot backbreed with either parental species. C Their winter habitat has no bearing on their degree of reproductive isolation. Heterochrony — an evolutionary change in the rate or timing of developmental events, has led to many striking evolutionary transformations. It was taller than the indigenous Spartina alternifolia. Researchers have examined species of snapping shrimp on both sides of the isthmus. Researchers have examined species of snapping shrimp on both sides of the isthmus.
When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents. Distinguish between microevolution and macroevolution. There is no accompanying information as to where or when they were collected. They spend the winter in these warmer areas, where they feed and prepare for the spring migration north and another breeding season. Biologists compare the physical characteristics or molecular sequences of species to those of other organisms to distinguish groups of individuals that are sufficiently different to be considered separate species.
These offspring will breed with each other or with birds from either parent population, and all offspring of these pairings appear intermediate to various degrees. With the development of the modern evolutionary synthesis in the 1930s and 1940s, Darwin's concept of evolutionary adaptation through natural selection became central to modern evolutionary theory, and it has now become the unifying concept of the life sciences. Journal of Herpetology 38 3 :381-92. A scientist mates two different organisms. C Yes, because they are reproductively isolated based on habitat. What outcomes could possibly occur where the ranges of two species overlap? B Cold temperatures, associated with deep water, have accelerated the mutation rate, resulting in faster divergence in deepwater shrimp. The different species pairs live at somewhat different depths in the ocean.
There are over 10,000 documents that have been added to the Members Only section that you won't find anywhere on this site or on the interwebs, for that matter. Females tend to mate where they feed, and the researcher finds a genetic basis for scent preference in these moths. What type of speciation will occur? The oceans were completely separated by the isthmus about three million years ago. The different species pairs live at somewhat different depths in the ocean. A The two parent species would interbreed and fuse into one species.
An individual in a wheat population transforms from a diploid to a tetraploid genome. After establishing themselves as separate species, they remain static for the vast majority of their existence. There are fifteen species on the Pacific side and fifteen different species on the Atlantic side. Exam Instructions: Choose your answers to the questions and click 'Next' to see the next set of questions. A hybrid zone exists at middle elevations, though hybrids there are greatly outnumbered by D.
A habitat isolation B temporal isolation C gametic isolation D behavioral isolation Use the following information to answer the question s below. Ideas about the transmutation of species were controversial as they conflicted with the beliefs that species were unchanging parts of a designed hierarchy and that humans were unique, unrelated to other animals. The western population also expanded its range somewhat eastward, and the two populations have recently come in contact. Based on the morphological species concept, there appeared to be seven pairs of species, with one species of each pair in the Pacific and the other in the Caribbean. A relative locations of two populations as speciation occurs B speed tempo at which two populations undergo speciation C amount of genetic variation that occurs among two gene pools as speciation occurs D identity of the phylogenetic kingdom or domain in which these phenomena occur 32 Among known plant species, which of these have been the two most commonly occurring phenomena that have led to the origin of new species? The researchers investigated mating in the lab and found that many species pairs were not very interested in courting with each other, and any that did mate almost never produced fertile offspring. A population of lizards is split by an earthquake which leaves half of the population on an island and the other half on the tip of the peninsula.
Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time. Which of the following is an example of polyploidy? If the isthmus formed gradually rather than suddenly, what pattern of genetic divergence would you expect to find in these species pairs? When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences. A biological B phylogenetic C ecological D morphological 17 Dogs Canis lupus familiaris and gray wolves Canis lupus can interbreed to produce viable, fertile offspring. Today, differences in body function, biochemistry, behavior, and genetic makeup are also used to differentiate species. Ash fall caused high levels of heavy metals in the ocean sediments underlying the deep water, resulting in accelerated mutation rates and faster divergence in deepwater shrimp. A allopolyploidy B autopolyploidy C habitat differentiation D sexual selection Use the following description to answer the question s below.
At higher elevations, and only on Sao Tomé, is found the very closely related Drosophila santomea. When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents. Darwin's book introduced the scientific theory that populations evolve over the course of generations through a process of natural selection. A zoo wants to assist two related endangered species with their reproduction and plans to directly implant the sperm into the female. Studies of the two species' nuclear genomes reveal that D. Thousands of years later, her numerous offspring occupy the island, but none of them resembles her.
A prezygotic isolation B reinforcement C allopatric speciation D sympatric speciation 27 Two researchers experimentally formed tetraploid frogs by fertilizing diploid eggs from Rana porosa brevipoda with diploid sperm from Rana nigromaculata. A They must have strong postzygotic isolating mechanisms to spend winter in such close proximity. Until you contribute 10 documents, you'll only be able to view the titles and some teaser text of the uploaded documents. A temporal reproductive isolation B lack of hybrid viability C behavioral reproductive isolation D habitat isolation Use the following information to answer the question s below. Use the following description to answer the question s below. When you have completed the practice exam, a green submit button will appear.