What factor allows the dominant mutant allele for Huntington's disease to persist in human populations
despite its devastating effects?
a. Heterozygote advantage.
b. The fact that its symptoms do not typically show until after the individual has had
children.
c. Its effects are not expressed in heterozygous individuals.
d. Its effects are only expressed in homozygous recessive individuals.
e. Its effects are only expressed in homozygous dominant individuals
B
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The genetic code is said to be ________ because more than one codon will specify a particular amino acid.
A. ambiguous B. degenerate C. repetitious D. multiplicative
Patterns of behavior that are species specific and highly repeatable are called displays and are an example of a ____ pattern
Fill in the blank with the appropriate word.
Active transport of various materials in plants at the cellular level requires all of the following except
A) a proton gradient. B) ATP. C) membrane potential. D) transport proteins E) xylem membranes.
Radiometric dating ____.
A. is based on the premise that each isotope decays at a constant rate B. is unpredictable because of changes in temperature and pressure C. can be used to date sedimentary rock, but not fossils D. has a substantial error factor E. can only be used for dating animal fossils