In experiments with laboratory populations of Drosophila melanogaster, Mukai and Burdick (1959 ) observed that a lethal allele maintained a higher than expected frequency
The explanation for this observation is that, at equilibrium, the selective advantage of the lethal allele when it occurs in heterozygotes balances the disadvantage of the allele in homozygotes, and is termed ________. A) equilibrium distribution
B) underdominance
C) allelic frequency dependence
D) overdominance
E) terminal dominance
D
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If RNA polymerase is missing in E coli _____, then transcription initiation would not occur at the appropriate initiation sites
A) amino acids B) mRNA C) sigma D) the holoenzyme
Which carbon reservoir contains the most carbon?
a. atmosphere
b. biomass on land c. lakes d. oceans e. soil
The bulk of a leaf consists of mesophyll, which is photosynthetic ____ with air spaces between cells
a. collenchyma b. parenchyma c. sclerenchyma d. phloem e. xylem
The pancreatic secretions governing glucose levels are precisely controlled by ____
a. neural connections to the pancreas b. a positive feedback loop c. cooperative interactions d. a negative feedback loop e. releasing factors