What is the name of the multicellular fungi that grow as branching filaments?
a. hyphae
b. mycorrhizae
c. basidia
d. asci
Ans: a. hyphae
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A population of mountain goats are split because of the formation of a glacier. After 50 years the glacier melts and the population reunites. Hybrid zones may occur if
A. both pre-mating and post-mating isolating mechanisms occur. B. reproductive isolation is incomplete. C. a geographic barrier is removed after reproductive isolation is complete. D. both pre-mating and post-mating isolating mechanism occur and reproductive isolation is complete. E. both pre-mating and post-mating isolating mechanisms occur and a geographic barrier is removed after reproductive isolation is complete are correct.
A fisheries biologist tells you she is studying a cohort of salmon returning to their birth river. What does this tell you about these salmon?
A. These salmon are iteroparous. B. Most of these salmon are one or two years old. C. All of these salmon are the same age. D. This group of salmon show a uniform distribution. E. The salmon are still too young for reproduction.
Geographically isolated population can evolve pre-zygotic or post-zygotic isolating mechanisms through natural selection or genetic drift
a. true b. false
The movement of sugars in a plant can be explained by
a) capillary action. b) transpiration pull. c) the pressure-flow hypothesis. d) root pressure.