adaptive radiation, The different finch species found on the Galpagos Islands probably arose as a result of _____. Describe the location of the stickleback spine. transcription Chapter 25 TEST Flashcards | Quizlet a decreasing number of viable, fertile hybrids is produced over the course of generations. Why do some stickleback populations lack pelvic spines?. 5. Which of the following has been shown to cause speciation most rapidly? True or false? The top layer of sediment was the first to be deposited, and therefore, it must be the oldest. A. Single-stranded RNA has many shapes. 4. RNA processing 16. Why do some stickleback populations lack pelvic spines? Calls would be about the same in both areas. One of the functions of pelvic spines in the ocean is to protect stickleback from larger fish predators. Make a prediction about what would happen in an isolated lake with few predators if humans introduced predatory fish like trout. In Europe, there is a long narrow hybrid zone, shown in red on the map, between the high-altitude habitat of the yellow-bellied toad and the lowland habitat of the fire-bellied toad. (Evolution, and in particular natural selection, can only select for the best available traits. Over many generations, populations of fish changed in many different ways, including in their skeletons. Also, predatory fishes are more likely to prey on stickleback rather than outcompete them for food. }. These results should be in general agreement with the results you graphed in Part 3 of this experiment. The lake in Nevada was originally populated by stickleback with pelvic spines, but large predatory fishes outcompeted these stickleback for food, which almost drove the stickleback population to extinction. In lakes where there are no predatory fish, there is no advantage to having pelvic spines. an area where members of two closely related species intermingle, but gene flow is prevented by prezygotic barriers document.write("
Incorrect. Your answer: " +prefsArray[192] + ". Watch the video about stickleback fish armor. Measuring three to 10 centimetres long, stickleback fish originated in the ocean but began populating freshwater lakes and streams following the last ice age. Click on the link at the top of the page to go to the "overview," then click on the interactive fish. It occurred in a similar DNA region in freshwater stickleback populations all over the world. the appearance of a new species in the same geographical area as the parent population Convergent evolution is said to have occurred if the mouse species on two islands with similar habitats are found to have similar characteristics even though they originated from different species that did not have these characteristics.
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