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Exam 1: Biology 1104 Questions With Complete Solutions
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Exam 1: Biology 1104 Questions With Complete Solutionsallopatric vs sympatric Correct Answer allo: results when a
population is separated by a physical barrier.; also known as
geographic isolation
sympatric: speciation that occurs without physical separation of
members of the population.
Be able to recognize (through an example), define, or describe
the various species interactions we studied: Predation or
parasitism, competition, mutualism, commensalism, and
amensalism. What is the effect on the different organisms:
positive, negative or neutral (+,-,0)? Correct Answer Predation
or parasitism - positive for the organism getting the nutrients,
negative for the one that isn't. ex: tick on a dog
competition: both negative outcomes b/c even the winner
exerted energy to win
Mutualism: both positive outcomes; both benefiting from the
relationship
Ex: butterfly on a flower
Commensalism - positive for one and neutral for another.
- Ex: throw banana peel on the ground; bird eats it
Amensalism: negative effect on one, no effect on the other
- Ex: stepping on an ant pile
Be able to recognize, assemble and describe a food chain and a
food web. What is a food web? How is energy being
transferred? Correct Answer Food web: a system of
interdependent food chains... a more complex and real world
way to express all trophic levels. follow all possible energy
paths
, Food chain: flow of energy through an ecosystem (simple);
follow one energy path
-Through trophic levels
Be able to tell what pollinates a plant based on its basic
characteristics. Correct Answer flowers attract pollinators
Can you interpret a simple phylogenetic tree and determine
which organisms are more closely related? What are derived
characteristics? Ancestral characteristics? What is an
evolutionary reversal? What is convergent evolution? How
might these two things confuse someone constructing a
cladogram or phylogenetic tree? Correct Answer -One that
evolved in the lineage leading up to a clade and that sets
members of that clade apart from other individuals
-One that is inherited from the common ancestor and has
undergone little change since
-When an organism reverts from a derived state back to that
ancestral state over many generations
-process whereby organisms not closely related, independently
evolve similar traits as a result of having to adapt to similar
environments or ecological niches
Define speciation. What are the 2 factors on which speciation
depends? (aka what has to happen for speciation to occur).
Recognize examples similar to the one in the book - geographic
isolation and genetic divergence/change. Or is it use of new
resource without migrating back to old resource (=isolation) and
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