Sometimes the most abundant color form of an animal is preyed upon more extensively than less
common forms. This illustrates the phenomenon of
a. stabilizing selection.
b. directional selection.
c. disruptive selection.
d. frequency dependent selection.
e. genetic drift.
D
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The hemoglobin gene is the only gene that is under selection for resistance to malaria
A. true B. false
Describe the process of double-fertilization in an angiosperm, and explain the significance of this process in plant evolution.
What will be an ideal response?
Which phyla lacks a vascular system?
A. Arthrophyta B. Pterophyta C. Gnetophyta D. Hepaticophyta E. Ginkgophyta
Which of the following statements concerning tetanus is FALSE?
A. Its only source is from deep puncture wounds from rusty nails. B. Its toxin causes simultaneous contraction of both muscles in an antagonistic pair. C. It is a small, motile, obligate anaerobe. D. It produces a terminal endospore that gives the cell a distinctive "lollipop" appearance. E. Its diagnostic feature is characteristic muscle contractions, which are often noted too late to save the patient.