When the concordance rate of a trait is significantly higher in identical twins than it is in fraternal twins, we can conclude that:
A. the trait has a strong genetic component.
B. the trait has a strong environmental
component.
C. the trait has a strong genotype-byenvironment
interaction.
D. the trait has a strong norm of reaction.
E. the trait has both a strong genetic
component and a strong norm of reaction.
A
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The reef building corals are not found below 60 m (200 feet) due to:
a. light requirements of the zooxanthellae. b. limited plankton as food. c. cold water. d. competition with non-reef building corals. e. predation by sea stars.
Which blood type is the universal donor?
a. A b. B c. AB d. O e. none of these
A wind system that influences large climatic regions
and reverses direction seasonally, producing dry and wet seasons, is referred to as a. a thermal current. b. an atmospheric upwelling. c. the jet stream. d. a monsoon. e. a cyclonic disturbance.
If each nucleotide coded for a single amino acid, how many different types of amino acids could be
combined to form proteins? a. 4 b. 16 c. 20 d. 64 e. 0