Biology Exam 1 (Quiz 2- CH 24 & 25)
C
What does the biological species concept use as the primary criterion for determining species boundaries? A. niche differences B. morphological similarity C. gene flow D. geographic isolation
A
House finches were found only in western North America until 1939, when a few individuals were released in New York City. These individuals established a breeding population and gradually expanded their range. The western population also expanded its range somewhat eastward, and the two populations have recently come in contact. If the two forms were unable to interbreed when their expanding ranges met, it would be an example of _____. A. allopatric speciation B. sympatric speciation C. reinforcement D. prezygotic isolation
A
Most causes of speciation are relatively slow, in that they may take many generations to see changes, with the exception of _____. A. polyploidy B. natural selection C. reinforcement D. colonization
C
The Permian period ended with a mass extinction event and then rapid speciation occurred as new animal and plant forms evolved. The most likely explanation for this is _____. A. increased mutation rates B. increased competition C. adaptive radiation D. continetal drift
C
The difference between geographic isolation (allopatric speciation) and habitat differentiation (sympatric speciation) is the _____. A. identity of the phylogenetic kingdom or domain in which these phenomena occur B. amount of genetic variation that occurs among two gene pools as speciation occurs C. relative locations of two populations as speciation occurs D. speed (tempo) at which two populations undergo speciation
C
Two species of frogs belonging to the same genus occasionally mate, but the embryos stop developing after a day and then die. These two frog species separate by _____. A. reduced hybrid fertility B. hybrid fusion C. reduced hybrid viability D. gametic isolation
C
What is thought to be the correct sequence of these events, from earliest to most recent, in the evolution of life on Earth? 1. origin of mitochondria 2. origin of multicellular eukaryotes 3. origin of chloroplasts 4. origin of cyanobacteria 5. origin of fungal-plant symbioses A. 4, 1, 2, 3, 5 B. 4, 3, 2, 1, 5 C. 4, 1, 3, 2, 5 D. 4, 3, 1, 5, 2
B
Which of the following describes the most likely order of events in allopatric speciation? A. genetic isolation, divergence, genetic drift B.genetic isolation, genetic drift, divergence C. genetic drift, genetic isolation, divergence D. divergence, genetic drift, genetic isolation
A
Which of the following is the correctly hypothesized sequence of events in the origin of life? I. formation of protobionts II. synthesis of organic monomers III. synthesis of organic polymers IV. formation of DNA-based genetic systems A. II, III, I, IV B. II, III, IV, I C. I, III, II, IV D. I, II, III, IV
C
Which of the following was derived from an ancestral cyanobacterium? A. flagella B. mitosome C. chloroplast D. mitochondrion
B
Which of the various species concepts distinguishes two species based on the degree of genetic exchange between their gene pools? A. morphological B. biological C. phylogenetic D. ecological
B
You are confronted with a box of preserved grasshoppers of various species that are new to science and have not been described. Your assignment is to separate them into species. There is no accompanying information as to where or when they were collected. Which species concept will you have to use? A. biological B. morphological C. phylogenetic D. ecological
