Disruptive selection occurs when
a. the environment controls which organisms will survive.
b. humans determine which organisms will survive.
c. the extremes of the population have a lesser chance to survive.
d. the extremes of the population have a better chance to survive.
e. the organisms on one extreme of the population have a better chance to survive than those on the other
extreme.
ANSWER: d
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The organisms that obtain energy by oxidation of hydrogen sulfide and use carbon dioxide as a carbon source are called
A. heterotrophs. B. chemoheterotrophs. C. autotrophs. D. chemolithoautotrophs.
Polyandry is the mating system in which ____
a. one male and one female form a long-term association b. both males and females mate with multiple partners c. one male mates with many females d. one female mates with many males e. both males and females provide care to offspring
If two copies of a gene are different alleles, the condition is referred to as ____
a. homozygous b. hybrid c. heterozygous d. codominant e. dominant
Which type of plankton are tiny and aquatic heterotrophs?
A. Zooplankton B. Phyplankton C. Tryplankton D. Metaplankton E. Holoplankton