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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

Which of the following does not change gene frequencies in populations?

A) migration B) diet C) mutation D) selection

Biology & Microbiology

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

Biology & Microbiology