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Unformatted text preview: y producers are required to support marine food chains. (D) Marine zooplankton often produce large extensions of their bodies in order to increase buoyancy. (E) The largest consumers in marine ecosystems, the baleen whales, are essentially filter feeders. 118. One theory of the evolution of cooperation in animals states that under conditions of low resource availability, some members of a population are willing to sacrifice their own efforts to reproduce to ensure that the population as a whole will not exhaust all its resources and go extinct. Which level of selection is described in this model? (A) (B) (C) (D) (E) Directional selection Individual selection Disruptive selection Stabilizing selection Group selection 119. Charles Darwin discussed all of the following EXCEPT: (A) Natural selection tends to remove those organisms that are poorly adapted to their environments. (B) Individuals in a population compete with one another for limited resources. (C) Gene mutations are the source of variation for evolution. (D) Organisms tend to produce more offspring than can survive in each generation. (E) Individuals within species exhibit variability in form and function. GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 38 121. Two populations of sunflowers, A and B, differ in the heritability of the oil content in their seeds; H2 equals 0.40 in population A, while H2 equals 0.70 in population B. Which of the following statements about these sunflower populations is correct? (A) Population A’s seeds have a lower oil content than those of B. (B) The variability in seed oil content is higher in population B than in A. (C) Population A grows in a more diverse and unstable environment than does B. (D) Proportionately more phenotypic variation is environmental variation in population A than in B. (E) Population B has more genetic variation for seed oil content than does A. 122. From an evolutionary point of view, plant tendrils derived from leaves and those derived from stems are examples of (A) analogous structures resulting from convergence only (B) homologous structures resulting from convergence only (C) analogous structures resulting from divergence only (D) homologous structures resulting from divergence only (E) both analogous and homologous structures resulting from divergence 123. Which of the following is characteristic of allopatric speciation? (A) (B) (C) (D) (E) Large populations Asexually reproducing populations Geographic isolation Isolation through adaptation of alleles The sudden appearance of new species 1 Tyrannosaurus (dinosaur) 2. Lobe-finned fishes 3. Great apes 4. Eohippus (horse) 5. Trilobites 124. Which of the following represents the proper sequence, from the earliest in the fossil record to the latest, of the animals listed above? (A) (B) (C) (D) (E) 1, 2, 5, 4, 3 2, 5, 1, 3, 4 2, 5, 1, 4, 3 5, 1, 2, 3, 4 5, 2, 1, 4, 3 125. Invasion of the land by vascular plants most likely began in which of the following periods? (A) (B...
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This document was uploaded on 03/16/2014 for the course BIO 1434 at UT Arlington.

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