Pleiotropic genes
a. act on secondary sexual characteristics.
b. influence more than one aspect of a
phenotype.
c. are additive.
d. produce lethal effects when homozygous.
e. fit none of these characteristics
B
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Which is the exotoxin of botulism?
A. Botulinum B. Hemolysin C. Tetanospasmin D. Factor V E. Peroxidase
Assuming that the rate of sea-floor spreading was constant during the one-million-year period depicted above, on average Earth's magnetic field has undergone reversal once every _____
A) 25,000 years B) 100,000 years C) 250,000 years D) 1,000,000 years
Figure 43.5A
The above figure of a young cuckoo shoving its foster parents' egg out of the nest best demonstrates _____.
A. imprinting behavior B. instinctive behavior C. classical conditioning D. learned behavior E. operant conditioning
What are the consequences if decomposers are removed from the carbon cycle?
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