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Biology 1104 Exam 1 Questions With Complete Solutions
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Biology 1104 Exam 1 Questions With Complete SolutionsAdaptation Correct Answer The accumulation of diverse and
inherited modifications that fit organisms to specific ways of life
in their environment
allopatric speciation Correct Answer The formation of new
species in populations that are geographically isolated (split by
mountain, river, etc) from one another.
Analogy Correct Answer similarity due to convergent
evolution rather than to descent of a common ancestor
Are large or small populations more prone to the impacts of
genetic drift? Correct Answer Small Populations
At what scale do microevolutionary processes happen? Correct
Answer Small scale
Binomial Correct Answer In the Linnaean System, biologist
assign a two part scientific name to organisms
biological species concept Correct Answer a population or
group of populations whose members have the potential to
interbreed in nature and produce viable, fertile offspring, but are
not able to produce viable, fertile offspring with members of
other populations.
Biology Correct Answer the scientific study of life
,bottleneck effect Correct Answer Genetic drift resulting from a
drastic reduction
in population size. Typically, the surviving population is no
longer genetically representative of the original population
Clade Correct Answer consists of an ancestral species and all
its evolutionary descendants - a distinct branch in the tree of life
convergent evolution Correct Answer occurs when similar
environmental pressures and natural selection produce similar
(analogous) adaptations in organisms from different
evolutionary lineages
dependent variable Correct Answer The measurable effect,
outcome, or response in which the research is interested.
dependent variable example Correct Answer height of plant
Describe the four "steps" of natural selection Correct Answer
Step 1) Variation in a heritable (genetic) trait exists within a
population
Step 2) Selective pressure (not everyone will reproduce)
Step 3) Relative Fitness(contribution an individual makes to
gene pool of next generation), Some trait values result in higher
relative fitness than other
Step 4) Adaptation: heritable traits that confer higher fitness are
passed down & eventually become common or fixed in the
population
Describe the two "steps" of gene flow Correct Answer 1)
Variation in heritable genetics
, 2) Migrants occasional move (migrate) from one population to
the other, introducing "new" alleles into their new populations
Describe three different ways that a fossil may form. Correct
Answer Amber encased organisms, Imprints from soft tissue,
bones or other mineral body parts that don't decay.
Do all mutations result in evolution? Correct Answer No, some
occur in body cells, but not gametes, so are not passed on. Some
occur frequently but aren't significant because the mechanisms
of evolution aren't acting. Mutations act as source of variation**
for evolution to act on
Do mutations always result in evolution? Why or why not?
Correct Answer No, some occur in body cells, but not gametes,
so are not passed on. Mutation occurs frequently, but won't
change the allele frequency if other agents(gene drift, flow, and
natural selection) of evolution don't do their job.
Domains Correct Answer largest classification category;
includes bacteria, archaea, and eukarya
ecological species concept Correct Answer identifies species in
terms of their ecological niches, focusing on unique adaptations
to particular roles in a biological community
evolutionary tree Correct Answer A branching diagram that
reflects a hypothesis about evolutionary relationships among
groups of organisms.
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