ch28.pdf - Exam MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question 1 There are a number of mechanisms

ch28.pdf - Exam MULTIPLE CHOICE Choose the one alternative...

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ExamMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1)There are a number of mechanisms that operate to maintain genetic diversity in a population.Why?1) A)Genetic diversity helps populations avoid diploidy.B)Homozygosity is an evolutionary advantage.C)Diversity may better adapt a population to inevitable changes in the environment.D)Diversity leads to inbreeding advantages.E)Greater genetic diversity increases the chances of haploidy. 2)What term is applied to proteins produced by alleles producing slightly differing electrophoreticforms of proteins with apparently identical functions?2) 3)What method is often used to analyze proteins and nucleic acids by physical separation whenestimating genetic variation in populations?3) 4)What is the term applied to a form of speciation in which one species gives rise to two distinctdaughter species?4) 5)What is the general term used to group various biological and behavioral properties of organismsthat act to prevent or reduce interbreeding?5) A)genetic divergenceB)allopatric speciationC)phyletic evolutionD)inbreedingE)reproductive isolating mechanismsSHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.6)Richard Lewontin has estimated that about ________ (fraction) of all loci are polymorphic. In any individual within that group about ________ (fraction) of the loci exhibit genetic variation in the form of heterozygosity. 6) 1
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7) Genetic diversity can be assessed at a variety of levels: DNA sequences, proteins, andchromosomes. Briefly describe methods that are currently used to assess diversity at eachof the levels mentioned.7) 8) Present a rationale for using DNA sequence polymorphisms as an index of geneticdiversity. Is genetic diversity directly proportional to evolutionary (phylogenetic)diversity?
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