Echinoderms often have an important ecological effect on their environment. Provide at least 2 examples of their effects in particular locations
What will be an ideal response?
Pacific coral reefs were being damaged by the crown-of-thorns sea star predation on corals. Sea urchin explosions have been attributed to a reduction in kelp forests off California. The sea urchin population became excessive in the Atlantic, preventing lobsters from accessing traps, and leading the fisherpersons to switch from lobsters to sea urchins.
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Why might these species be the first to recover?
a. Grasses were not eliminated by the fire, prairie dogs and antelope have mobility. b. Grasses have a short generation time, as do prairie dogs and antelope. c. Grass reproduction is stimulated by fire, and prairie dogs and antelope both feed on grasses. d. None of the above.
What do the founder effect and the bottleneck effect have in common?
A. Both the founder effect and the bottleneck effect are examples of disruptive selection. B. Both the founder effect and the bottleneck effect are forms of genetic drift. C. Both the founder effect and the bottleneck effect result from an increase in gene flow. D. Both the founder effect and the bottleneck effect result from mutation.
Which of the following hormones directly stimulates the development of male secondary sex characteristics?
What will be an ideal response?
A group of dog breeders is trying to design and develop an ideal dog. They want a dog with a gentle disposition, black fur, long ears, short legs, and a strong sense of smell. Which of the following comments from fellow dog breeders represents the
biggest challenge they are likely to face? A) There are breeds with long ears and breeds with short legs, but no breeds with both. B) There does not seem to be any genetic variation in sense of smell. C) Artificial selection is artificial and cannot change the genetics of a breed like natural selection. D) Most dogs with black fur have long legs.