Carriers for sickle-cell disease have a genetic advantage in some situations over those who do not have
any copies of the sickle-cell allele because carriers have
a. lower blood pressure.
b. the ability to carry more oxygen in their blood.
c. increased resistance to malaria.
d. hyperactive immune systems.
e. extra red blood cells.
C
You might also like to view...
Recall that, through respiration, organisms release the energy contained in organic compounds. This energy, in turn:
A. increases as it moves through the upper levels of a trophic pyramid. B. increases as it moves through the upper levels of a food web. C. moves in a bi-directional manner between the levels of a food web. D. moves in a bi-directional manner between the levels of a trophic pyramid. E. decreases as it moves through the upper levels of a trophic pyramid. F. decreases as it moves through the upper levels of a food web.
The letter “B” from above represents which of the
following? a. nucleus of the flame cell b. small capillaries which allow water to freely diffuse into the planarian c. sexual reproductive organ of the planarian d. cilia which flick to draw fluid into the planarian e. none of these
Which of the following does not change gene frequencies in populations?
A) migration B) diet C) mutation D) selection
Which of the following is NOT a function of the eukaryotic cytoskeleton?
A. anchors organelles B. gives shape to the cell C. packages cellular secretions D. performs endocytosis E. aids in contraction of the cell