An organism's role within the structure and function of a particular community is its:a
habitat.
b. trophic level.
c. population.
d. ecological niche.
e. competition.
d
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This region exhibits 90% interference. How many double crossovers would be recovered in a three-point cross involving b, c, and sp out of 1000 progeny?
In Drosophila, the genes b, c, and sp are linked and arranged as shown below: b——30 m.u.——c——20 m.u.——sp A) 3 B) 6 C) 54 D) 60 E) 600
What do hammerhead sharks have in common with goldfish?
A. They both have a cartilaginous skeleton. B. They both have a calcium-enforced skeleton. C. They both have a lateral line system. D. They both have an operculum.
Chromatin condenses to form discrete, visible chromosomes
a. early in G1. b. during S. c. during telophase. d. during prophase. e. at the end of cytokinesis.
It is likely that vestigial traits remain in place for some organisms when they serve no current functions be-cause:
a. the trait is not costly to the organism. b. natural selection does not act against the trait. c. there is some natural selection against the trait—it is on its way out and will eventually be lost. d. All of the above.