The uplift of the Isthmus of Panama, a geological event that occurred about five million years ago, separated
populations of marine organisms and led to ____.
a. allopatric speciation
b. sympatric speciation
c. gametic isolation
d. hybrid sterility
e. hybrid inviability
ANSWER: a
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A. reverse transcriptase. B. capsid. C. integrase. D. surface glycoprotein. E. protease.
What is carried in the plasma of vertebrate animals? What percentage of whole blood is plasma?
What will be an ideal response?
Which of the following is NOT a mechanism of genetic change in populations?
a) genetic drift b) mutation c) natural selection d) biogeography e) migration
How do most mutations affect an organism?
A) Most mutations create cancerous cells. B) Most mutations either are harmful, or they have no effect. C) Most mutations are beneficial and create a more adapted organism. D) Most mutations will kill the organism.