Bio Exam 1

50 Questions  I  By Itsaliciayall8
Bio Exam 1

  
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1.  Which of the following is a true statement concerning genetic variation?
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2.  In the formula for determining a population’s genotype frequencies, the 2 in the term 2pq is necessary because  
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B.
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3.  During an individual oganism’s lifetime, which of these is most likely to help the organism respond properly to changes in its environment?
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B.
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D.
4.  Which of the following types of reproductive barriers separates a pair of species that could interbreed except that one mates at dusk and the other at dawn?
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B.
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5.  Evolution
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6.  Over time, the movement of people on Earth has steadily increased. This has altered the course of human evolution by increasing
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D.
7.  During breeding season, one should expect female house finches to prefer to mate with males with the brightest red feathers. Which of the following terms are appropriately applied to this situation?
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8.  Which of the following statements best summarizes evolution as it is viewed today?
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9.  Which of the following is most likely to produce an African butterfly species in the wild whose members have one of two strikingly different color patterns?
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10.  Which of the following must exist in a population before natural selection can act upon that population?
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11.  Frequently, a group of related species will each have a unique courtship ritual that must be performed correctly for both partners to be willing to mate. Such a ritual constitutes a_________ , _________ reproductive barrier.
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12.  The recessive allele that causes phenylketonuria (PKU) is harmful, except when an infant’s diet lacks the amino acid phenylalanine. What maintains the presence of this harmful allele in a populations gene pool?
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13.  The largest unit within which gene flow can readily occur is a
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14.  Natural selection changes allele frequencies because some _________ survive and reproduce more successfully than others.
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15.  No two people are genetically identical, except for identical twins. The main source of genetic variation among human individuals is
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16.  Sexual dimorphism is most often a result of
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17.  Which of the various species concepts distinguishes two species based on the degree of genetic exchange between their gene pools?
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18.  Dog breeders maintain the purity of breeds by keeping dogs of different breeds apart when they are fertile. This kind of isolation is most similar to which of the following reproductive isolating mechanisms?
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19.  Which of the following would a biologist describe as microevolution?
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20.  Two species of frogs belonging to the same genus occasionally mate, but the offspring fail to develop and hatch. What is the mechanism for keeping the two frog species separate?
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21.  According to the concept of punctuated equilibrium, the “sudden” appearance of a new species in the fossil record means that
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22.  Speciation
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23.  Which of the following statements about speciation is correct?
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24.  In order for speciation to occur, what must be true?
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25.  Sea urchins release their gametes into the water without courtship. Which of these reproductive isolation mechanisms might operate for sea urchin species?
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26.  Which of the following types of reproductive barriers separates a pair of moth species that could interbreed except that the females’ mating pheromones are not attractive to the males of the other species?
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27.  A trend toward the decrease in the size of plants on the slopes of mountains as altitudes increase is an example
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28.   Speciation without geographic isolation is called _________ speciation.
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29.  The geographic isolation of a population from other members of the species and the subsequent evolution of reproductive barriers between it and the parent species describes _________ speciation.
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30.  Most polyploid species arise from
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31.  Charles Darwin was the first person to propose
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32.  Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings,illustrating
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33.  Darwin found that some of the species on the Galápagos islands resembled species of the South American mainland
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34.  The emergence of many diverse species from a common ancestor that finds itself in a new environment is called
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35.  Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection? 1. Well-adapted individuals leave more offspring than do poorly adapted individuals. 2. A change occurs in the environment. 3. Genetic frequencies within the population change. 4. Poorly adapted individuals have decreased survivorship.
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36.  Which of the following statement about Darwin following the voyage of HMS Beagle is incorrect?
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37.  If two modern organisms are distantly related in an evolutionary sense, then one should expect that
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38.  Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. If pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species, then which of these terms are applicable 1. sympatric species   2. prezygotic isolation   3. postzygotic isolation   4. allopatric species   5. habitat isolation  
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39.  Evolutionary trees are properly understood by scientists to be
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40.  . Broccoli, cabbages, and brussels sprouts all descend from the same wild mustard and can still interbreed. These varieties were produced by
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41.  Which of the following best expresses the concept of natural selection?
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42.  Which of the following represents a pair of homologous structures?
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43.  Genetic drift resulting from a disaster that drastically reduces population size is called
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44.  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?
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45.  Which of the following is not an observation or inference on which natural selection is based?
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46.  Although each of the following has a better chance of influencing gene frequencies in small populations than in large populations, which one most consistently requires a small population as a precondition for its occurrence?
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47.  Which of the following represents an idea that Darwin learned from the writings of Thomas Maithus?
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48.  The original source of all genetic variation is
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49.  Natural selection is based on all of the following except
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50.  A high proportion of the cats on Key West have extra toes (polydactyly). What is the most likely explanation?
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