1407 hcc exam 1 - Please do not write on the Exam BIOL 1407...

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Please do not write on the Exam! BIOL 1407 Houston Community College Exam 1 Instructor: A. Nesterovitch   MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.  1) 
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During a  study session  about  evolution,  one of your  fellow  students  remarks,  "The giraffe  stretched its  neck while  reaching for  higher leaves;  its offspring  inherited  longer necks  as a result."  Which  statement is  most likely to  be helpful in  correcting  this student's  misconceptio n? 
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Disuse of an organ  may lead to its  eventual  disappearance. 
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Only favorable  adaptations have  survival value. 
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Overproduction of  offspring leads to a  struggle for survival. 
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Spontaneous  mutations can result  in the appearance of  new traits. 
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Characteristics  acquired during an  organism's life are  generally not passed  on through genes.    The  following  questions refer to  Figure 22.1, which  shows an outcrop of  sedimentary rock  whose strata are  labeled A - D. Figure 22.1   2) 
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Which  stratum  should  contain the  greatest  proportion of  extinct  organisms?   
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If "x"  indicates the  location of  fossils of two  closely  related  species, then  fossils of  their most - recent  common  ancestor are  most likely to  occur in  which  stratum?   
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Which of the  following  must   exist  in a  population  before  natural  selection can  act upon that  population? 
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Genetic variation  among individuals 
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Sexual reproduction 
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Variation among  individuals caused by  environmental factors 
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B and C only 
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A, B, and C    The following  question refers to the  evolutionary tree in  Figure 22.2 . The tree's horizontal  axis is a timeline that  extends from 100,000  years ago to the  present; the vertical  axis represents  nothing in particular.  The labeled branch  points on the tree (V —Z) represent  various common  ancestors. Let's say  that only since  50,000 years ago has  there been enough  variation between the  lineages depicted  here to separate them  into distinct species,  and only the tips of  the lineages on this  tree represent distinct  species. Figure 22.2   5) 
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How many  separate  species, both  extant and  extinct, are  depicted in  this tree? 
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B) 
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C) 
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