A population of cichlid fishes in Lake Malawi, East Africa, experiences a reduction in habitat size due to changing lake levels. This in turn reduces the number of individuals in the population
During the same generation, only 10% of the males successfully reproduce by chance. Observed genotypic frequencies in the following generation are different from the ex-pected frequencies under Hardy–Weinberg because of:
a. random events.
b. drift.
c. differential survival.
d. differential reproduction.
e. All of the above.
E
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All of the following contraception techniques are aimed at preventing fertilization EXCEPT
a. withdrawal. b. intrauterine device. c. vasectomy. d. rhythm method. e. tubal ligation.
All of the following are requirements of a bacterial cloning vector EXCEPT:
A. Ti plasmid. B. selectable markers. C. origin of replication. D. unique restriction enzyme sites.
Bacteria and fungi are important decomposers. However, which decomposition function is almost entirely the work of fungi?
A) large-animal decomposition B) decomposition of bacterial mass C) final breakdown of woody material D) digestion of metallic materials in landfills
All of the following are benefits of food irradiation, except
A) It can kill insects on the food. B) It makes the food less nutritious. C) It can kill bacterial pathogens on the food. D) It can inhibit the sprouting of white potatoes. E) It can reduce the number of food-borne deaths each year.