Huntington disease in humans is an example of a(n) ____________
A. essential gene
B. lethal allele
C. semilethal allele
D. nonessential gene
E. conditional lethal allele
A
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Which of the following is NOT a characteristic by which a population is in equilibrium according to Hardy-Weinberg equation?
A. The population is large. B. There is no migration into or out of the population. C. There is no selection against a given genotype. D. There is no mutation in the gene being studied. E. There is nonrandom mating
When did life first appear on the planet?
A. 2.1 billion years ago B. 3.5 billion years ago C. 2.1 million years ago D. 3.5 million years ago
A highly threatened region that is home to many unique species is a(n) _____
a. ecoregion b. biome c. hot spot d. community
Of the following organs, which is NOT in the
abdominal cavity? a. stomach b. liver c. heart d. intestine e. pancreas