All of the following could result in an increase in the genetic variety within a gene pool except
A. mutation within the gene pool.
B. migration of individuals into the gene pool from other subspecies.
C. sexual reproduction with individuals of other gene pools.
D. selective breeding that creates individuals with specific sets of characteristics.
D. selective breeding that creates individuals with specific sets of characteristics.
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Which hormones counteract each other in regulating calcium homeostasis?
A. antidiuretic hormone and aldosterone B. atrial natriuretic peptide and aldosterone C. parathyroid hormone and vitamin D (1,25 dihydroxyvitamin D) D. antidiuretic hormone and parathyroid hormone E. antidiuretic hormone and vitamin D (1,25 dihydroxyvitamin D)
The function of the central vacuole in plants may include all of the following EXCEPT ____
a. protein synthesis b. storage of salts, sugars, and proteins c. enzymatic digestion d. storage of chemical defenses against pathogens e. storage of waste products
What is the ultimate source of a new allele in a gene pool?
a. natural selection b. mutation c. gene flow d. genetic drift
A drug that blocks the reuptake of the neurotransmitter serotonin ____
a. decreases the concentration of serotonin in the synapse b. can be used to elevate mood c. affects respiratory activity d. is used to treat hypertension e. enhances neurotransmitter release