A person flies from one continent to another. Unknowingly, he boards the plane with a few seeds attached to the laces of his hiking boots. As he is hiking at his destination, these seeds drop off and become planted. The seeds grow and interbreed with a closely-related native species also found at that location. After a few generations, the population where the seeds dropped have flowers with different shapes compared to the surrounding populations in the forest.
This is an example of
A.
gene flow.
B.
genetic drift.
C.
selection.
D.
disruptive selection.
Which of the following mechanisms will MOST consistently result in populations that adapt to a changing environment?
A.
gene flow
B.
genetic drift
C.
selection
D.
natural selection
Which of the following could result in allopatric speciation?
A.
Two populations of a species are separated by a river that they are unable to cross.
B.
Two populations of a species are separated by a field that is too dry during the summertime.
C.
One group within a population mates during the evenings and another during the mornings.
D.
One group within a population develops a new mating ritual that is not recognized by the other.
Which process in a hybrid zone increases the likelihood of speciation?
A.
stability – when a hybrid zone remains the same
B.
reinforcement – when a hybrid zone widens and fewer hybrids are formed
C.
convergence – when a hybrid zone narrows and more hybrids are formed
D.
fusion – when a hybrid zone disappears and separate species fuse into one
Based on current knowledge, which cellular trait is MOST likely the oldest?
A.
photosynthesis
B.
multicellularity
C.
presence of a nucleus
D.
presence of chloroplasts
Adaptive radiation is when
A.
a species develops a new trait.
B.
several species move to a new location.
C.
the number of species in an area rapidly increases in number.
D.
the number of species in an area rapidly decreases in number.
Hox genes regulate the development of
A.
the body plan of an embryo.
B.
gametes.
C.
the respiratory system only.
D.
the circulatory system only.
Evolution results in an increase of organisms that are
A.
larger.
B.
more complex.
C.
better suited to the current environment.
D.
better able to adapt to changing environments.
Where on a phylogeny are ancestral organisms for two groups found?
A.
at the end of the rightmost branch
B.
at the end of the leftmost branch
C.
on the nodes between the two groups
D.
as a perpendicular line crossing a branch
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