In seedcracker finches from Cameroon, small- and large-billed birds specialize in cracking soft and hard seeds, respectively. If long-term climatic change resulted in all seeds becoming hard, what type of selection would then operate on the finch population?
A) disruptive selection
B) directional selection
C) stabilizing selection
D) sexual selection
E) No selection would operate because the population is in Hardy-Weinberg equilibrium.
Ans: B) directional selection
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A. An intragenic mutation that restores the inactive protein's structure B. An intergenic mutation that increases the activity of a protein performing a different function as the mutated protein C. An intergenic mutation that activates a transcription factor that increases the espression of a normal protein D. A mutation that suppresses cell growth
Define epistasis and give an example
What will be an ideal response?
Select the pairing that is incorrect
a. disaccharide – two sugar subunits b. monosaccharide – one sugar subunit c. polysaccharide – three (only) sugar subunits d. polysaccharide – three or more sugar subunits
What does RNA polymerase bind to in order to initiate transcription?
A) DNA promoter region B) RNA promoter region C) start codon D) mRNA