Use the following information to answer the question. About 3 million years ago, the Isthmus of Panama (a narrow strip of land connecting North and South America) formed, dividing marine organisms into Pacific and Caribbean populations. Researchers have examined species of snapping shrimp on both sides of the isthmus. 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. The different species pairs live at somewhat different depths in the ocean. Using mitochondrial DNA sequences, the researchers estimated phylogenies and found that each of these species pairs, separated by the isthmus, were indeed each other's closest relatives. 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. (Reference: Y. Kondo and A. Kashiwagi. 2004. Experimentally induced autotetraploidy and allotetraploidy in two Japanese pond frogs. Journal of Herpetology 38(3):381-92.) If the isthmus formed gradually rather than suddenly, what pattern of genetic divergence would you expect to find in these species pairs?
Answers: 3
Biology, 22.06.2019 10:50
The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.
Answers: 1
Biology, 22.06.2019 10:50
What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis
Answers: 2
Biology, 23.06.2019 03:30
The first supersonic flight was 1947. it was just above the speed of sound. which altitude would you expect captain yeager to have used for his flight? a) sea level b) 1000m c) 13,700m (within altitude used by commercial planes today) d) 85,000m (where meteor showers originate) will mark brainlist
Answers: 1
Use the following information to answer the question. About 3 million years ago, the Isthmus of Pana...
Mathematics, 10.12.2020 22:30
Mathematics, 10.12.2020 22:30
English, 10.12.2020 22:30
Mathematics, 10.12.2020 22:30
Social Studies, 10.12.2020 22:30
History, 10.12.2020 22:30
Mathematics, 10.12.2020 22:30
Mathematics, 10.12.2020 22:30
Mathematics, 10.12.2020 22:30
History, 10.12.2020 22:30
Physics, 10.12.2020 22:30
History, 10.12.2020 22:30
Mathematics, 10.12.2020 22:30
Mathematics, 10.12.2020 22:30
Health, 10.12.2020 22:30