Download Biology Quiz 2 Answers and explanations Note there were two forms

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Transcript
Biology Quiz 2 Answers and explanations
Note there were two forms of the quiz, which were indicated in the lower left hand corner. This
was done to discourage basing your answer on the person sitting next to you.
Q1. Mutation is the ultimate source of all genetic variation. Selection does not increase genetic
variation in a population, it decreases it.
Q2. Kingdom, Phylum, Class, Order, Family, Genus, Species (Recall the silly saying; Kings
Play Chess On Fat Guys’ Stomachs)
Q3. If a farmer applied a weed killer continuously for 25 years, two things could happen; 1) the
weeds could become resistant, therefore the product would no longer be effective, and 2) genetic
diversity of the weeds could decrease after continued selection. This was an analogous example
to bacteria and selection by antibiotics. A third possibility exists (but not an answer on the quiz);
no evolution towards chemical resistance could develop and the product remains effective.
Q4. The two wrong answers were Eukaryotic bacteria and Prokaryotic bacteria. These are not
names of taxa at the Kingdom level.
Q5.
Natural selection is not the only force leading to evolution of populations. Genetic drift
(chance) can lead to evolution (changes in gene frequencies in a population). I gave you an
example in class about a population being divided in two by a meandering river. Genetic drift
was also in your reading assignment. Besides genetic drift, artificial selection also can lead to
evolution of populations.