On the posterior surface of the superior (1st part) of the duodenum we can find all the following structures except:
A. Inferior Vena Cava
B. Portal Vein
C. Gastroduodenal artery
D. Aorta
E. Bile duct
Answer: D. Aorta
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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.
Two or more alleles of a gene are circulating at relatively high frequency in a population's gene pool. What term describes this state?
a. frequency-dependent selection b. polyploidy c. multiple allele systems d. balanced polymorphisms e. prominent alleles
Gametes are formed at stage ____
a. A b. B c. C d. D e. E
As cells grow, the amount of surface area increases by the ____ but volume increases by the ____.
A. square (X2), cube (X3) B. cube (X3), square (X2) C. minute, hour D. minute, day