If all offspring of a cross have the genotype Aa, the
parents of the cross are most likely
a. AA x aa.
b. Aa x Aa.
c. Aa x aa.
d. AA x Aa.
e. none of these.
Answer: a
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Competitive release is most likely to occur when a
A) species colonizes an island that already has potential competitors. B) species moves into new habitats that it never occupied on a mainland. C) species decreases in abundance. D) competing species is added to a community.
An inhibitor of phosphodiesterase activity would have which of the following effects?
A) block the response of epinephrine B) decrease the amount of cAMP in the cytoplasm C) block the activation of G proteins in response to epinephrine binding to its receptor D) prolong the effect of epinephrine by maintaining elevated cAMP levels in the cytoplasm E) block the activation of protein kinase A
Sympatric speciation differs from allopatric speciation because in sympatric speciation
A. there are no physical barriers against interbreeding. B. a population becomes geographically isolated. C. hybrid zones form. D. polyploidy must first arise. E. two populations of the same species merge to form a single population.
Some RNA viruses direct the synthesis of double-stranded DNA at some point in their life cycle.
Answer the following statement true (T) or false (F)