A cell's metabolic pathways can be taken over by the DNA from a
A. bacteria.
B. fungus.
C. virus.
D. host.
C. virus.
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Heritability may be calculated as which of the following?
A. The total variance minus environmental variance B. Total variance minus genetic variance C. Genetic variance divided by environmental variance D. Genetic variance divided by total variance
Which of the following has the highest photosynthetic efficiency in hot and dry environments?
A. C3 plants B. C4 plants C. plants undergoing photorespiration D. plants that use oxygen to produce sugars E. plants that only produce sugar in the dark
Segmented genomes in negative-strand RNA viruses may include two to eight segments each coding for a unique protein.
Answer the following statement true (T) or false (F)
During normal climatic conditions with regular rainfall, the average beak depth for a population of finches was 6.8mm. Researchers found that after a drought, average beak depth increased to 8.8mm. Birds with deep beaks (>9mm) were better able to eat large, hard seeds. Small hard seeds were also available after the drought, but could only be eaten by birds with shallow beaks (<7mm). Choose the graphical representation and term that best represents what would happen in the post-drought finch population if both types of seeds continue to be available.
a. directional selection.
b. disruptive (diversifying) selection.
c. stabilizing selection.
d. balancing selection.
e. negative frequency-dependent selection.
