In the case of Mendel's peas, a single gene determined the height of the plant; however, in humans, adult height is influenced by many genes. A trait such as human height is said to be
a) codominant
b) polygenic
c) multi-allelic
d) incompletely dominant
e) pleiotropic
Answer: b) polygenic
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Which of the following has the greatest effect on the rate of chemical cycling in an ecosystem?
A) the ecosystem's rate of primary production B) the production efficiency of the ecosystem's consumers C) the rate of decomposition in the ecosystem D) the trophic efficiency of the ecosystem E) the location of the nutrient reservoirs in the ecosystem
Which one of the following represents the pH of a solution with the highest concentration of hydrogen ions?
A. 1.0 B. 4.5 C. 7.0 D. 9.1 E. 11.5
What is a deficiency of oxygen in the tissues called?
A) hypercapnia B) hypoxia C) hypoxemia D) hypocapnia E) apnea
Amniocentesis and chorionic villi sampling are performed in order to
a. Discover the gender of the baby b. analyze the chromosomes c. check for limb abnormalities d. none of the above