All of the following are examples of prezygotic genetic isolating mechanisms EXCEPT:
a. Male fireflies of different species have different flash patterns.
b. Three closely related orchid species flower on different days.
c. The progeny of a cross between two different lizard species fail to develop properly.
d. One species of snake lives in water and another is terrestrial.
e. Peeper frogs mate in April, and tree frogs mate in June.
Ans: c. The progeny of a cross between two different lizard species fail to develop properly.
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The evolution of flower symmetry is best explained by
A. a new gene mutation. B. the modification of an existing gene for a new function. C. homoplastic convergence. D. gene duplication and divergence. E. conserved genes.
The "poles" of a cell are its
a. centrosomes. b. centromeres. c. autosomes. d. centrioles. e. automeres.
During the process of gel electrophoresis, the DNA fragments migrate due to the effects of ____
a. gravity b. vibrations
c. electrical charge d. magnetic attraction e. centrifugal force
In a recent surgery, when the cut area was sutured, bacteria entered the open tissue. As a result, you now have an infection of deep tissue exhibiting redness, swelling, pain, fever, and a rash. With your knowledge of microbiology, you predict that you have a developed an infection caused by ________.
A. Staphylococcus B. E. coli C. Neisseria D. human herpesvirus 3