The most common meaning of biodiversity is ___________.
a) the number of different ecosystems in a geographical area or on Earth
b) the assortment of different chemicals produced by different organisms
c) the number of species in a location or on Earth
d) the amount of genetic raw material available for adaptation
Ans: c) the number of species in a location or on Earth
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You give up on the garden and ignore it for a third summer. You notice that two small birch trees sprout and begin to grow among the sunflowers
The birch trees are slower growers than the sunflowers, but by the fifth summer they start to shade the sunflowers. The birch trees and the sunflowers are in competition for: A. water. B. light. C. nutrients. D. All of the responses are correct. E. None of the responses is correct because competition only occurs between members of the same species.
People with the disease known as sickle-cell anemia are often better able to survive malaria because of
a. balanced polymorphism. b. heterozygote advantage. c. frequency dependent selection. d. disruptive selection. e. stabilizing selection.
Juvenile diabetes (or insulin-dependent diabetes) results when insulin-producing cells in the pancreas are destroyed by
the patient's own immune system. a. True b. False
In the ABO blood type system in humans, there are _________ different alleles, ____________ different phenotypes, and ____________ different genotypes.
a) six; three; six b) three; four; three c) six; six; three d) six; six; four e) three; four; six