The distribution of the genetic disorder called sickle-cell anemia is correlated with the distribution of
malaria in tropical countries. This is an example of
a. heterozygote advantage.
b. frequency-dependent selection.
c. a genetic bottleneck.
d. genetic drift.
e. evolutionary convergence.
A
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Which group of organisms has an exoskeleton?
a. annelids b. arthropods c. cnidarians d. roundworms e. flatworms
Which one of the following options applies to chytrids?
A. form basidia during sexual reproduction B. are the source of penicillin C. form symbiotic relationships with algae D. have flagellated gametes
Choose the most appropriate description for each term
A. cerebellum B. nerve net C. thalamus D. frontal lobe E. peripheral nervous system F. acetylcholine G. medulla oblongata H. white matter I. limbic system J. autonomic nervous system K. meninges L. hippocampus M. corpus callosum N. parasympathetic neurons O. hypothalamus
One of the important inherited defects in the second line of immune defense is a condition called chronic granulomatous disease. What is this disease, and how is it caused?
What will be an ideal response?