Dr. Smith's parents have normal hearing. However, Dr. Smith has an inherited form of deafness. Deafness is a recessive trait that is associated with the abnormal allele d. The normal allele at this locus, associated with normal hearing, is D. Dr. Smith's
parents could have which of the following genotypes?
A) DD and dd
B) dd and dd
C) Dd and Dd
D) Dd and DD
Answer: C
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A) having the same competition coefficient. B) zero-growth isoclines. C) competitive exclusion. D) niche differentiation.
Sometimes, the decline of one species threatens the survival of another species. Which scenario is an example of this?
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Indicate whether the response is due to parasympathetic or sympathetic action.
A. decreases heart rate B. decreases adrenal gland secretions C. slows digestion D. inhibits urination
Which of the following can be used to help classify actinomycetes?
A. Phospholipid composition of the membrane B. Cell wall composition C. Percent G + C content D. All of these can be used to classify actinomycetes.