The Microscopic Roundworm Caenorhabditis Elegans Is a Host for the Pathogenic

question 60

Multiple Choice

The microscopic roundworm Caenorhabditis elegans is a host for the pathogenic bacterium Serratia marcescens.Researchers genetically manipulated the mating system of C.elegans, producing populations that mated either sexually or asexually (by self-fertilization) .When exposed to the S.marcescens parasite, self-fertilizing populations of C.elegans rapidly became extinct.Sexually reproducing populations survived.This suggests that, to maintain healthy populations, C.elegans requires

• A) the absence of S. marcescens.
• B) the presence of S. marcescens.
• C) genetic variation, which allows adaptation to S. marcescens.
• D) genetic uniformity, which leads to stable populations.
• E) a natural ecosystem where genetic manipulation does not occur.

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