Bio20c Exam1Wtr16Key.pdf - Bio 20cW16 First Midterm...

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Bio 20cW16 First Midterm Name/SID In the space below, state Darwin/Wallace’s theory of evolution (4)New species arise via descent with modification of ancestral species and the mechanism for this is natural selection Next to each statement below, place the name of the individual from the list at the end of this sentence that would be best associated with the statement. shared via CourseHero.comHutton, Lamarck, Linneaus, Malthus, Smith. (8) Organisms can acquire changes that they pass on to their offspring. Lamark Organisms can be catalogued as members of the same group based on shared traits. Linneaus The same processes that alter the earth today have altered it in the past. Hutton When resources become limited there is increased competition for those resources. Malthus Cephalopods are a group mollusks that are related to snails (gastropods) and clams. They include the chambered nautilus, squid and octopus. Shells are a feature that were present in ancestral mollusks and they can be found in the modern day mollusks mentioned above. In early cephalopods, the shell was used both for protection and as a buoyancy chamber that allowed them to develop the ability to float and later swim. This characteristic is still found in some modern cephalopods such as the nautilus, but in others such as squid or octopus the shell is either reduced or absent. Using this information answer the following questions: What term would best describe the relationship of shells in snails, clams, and squid? (2)
What term would best describe the small internal shell found in squids? (2)
How would the fossil of the early cephalopod (pictured above) be best described in relation to the early gastropod and nautilus (also pictured above?) (2)
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For each of the scenarios described below indicate what micro-evolutionary force is influencing the population (be as specific as possible for instance if it is natural selection, state what type) and then indicate whether it is increasing or decreasing the genetic diversity of the population. (8) In a habitat there are red bugs and green bugs. The birds prefer the taste of the red bugs, so soon there are many green bugs and few red bugs.

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