In an isolated population of fruit flies, 4 percent of the individuals have "pink eyes", a homozygous
recessive condition, and 96 percent have the dominant black eye phenotype. What percentage of the
population are heterozygotes?
a. 32 percent
b. 16 percent
c. 48 percent
d. 88 percent
e. 4 percent
A
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During the inflammatory response, dilation of blood vessels is caused by
A. nitric oxide. B. histamine. C. cytokines. D. phagocytes. E. both histamine and nitric oxide.
The division of cytoplasm is accomplished during
a. prokaryotic fission. b. interphase. c. meiosis. d. cytokinesis. e. karyokinesis.
Which organ or structure aids in digestion but is not part of the human alimentary canal?
A. esophagus B. mouth C. liver D. stomach E. small intestine
Which of the following human genetic disorders is caused by a dominant allele?
a. hemophilia b. sickle cell anemia c. cystic fibrosis d. Huntington's disease