In the United States, the parasite that causes malaria is not present, but African-Americans whose ancestors were from equatorial Africa are present

What should be happening to the sickle-cell allele in the United States, and what should be happening to it in equatorial Africa? A) stabilizing selection; disruptive selection
B) disruptive selection; stabilizing selection
C) directional selection; disruptive selection
D) directional selection; stabilizing selection


D

Biology & Microbiology

You might also like to view...

Latex or resin canals evolved independently in more than 40 different lineages of plants

A. true B. false

Biology & Microbiology

The diffusion bioassay

A. determines the concentration of antimicrobial necessary to kill a bacteria. B. determines the concentration of antimicrobial necessary to inhibit growth of a bacteria. C. is similar in principle to the Kirby-Bauer test. D. determines the concentration of antimicrobial in a fluid. E. is similar in principle to the Kirby-Bauer AND determines the concentration of antimicrobial in a fluid.

Biology & Microbiology

The primary mycelium of basidiomycetes is dikaryotic

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

Older roots can become extremely thick and woody as ________ accumulates during secondary growth.

A. Secondary phloem B. Sapwood C. Primary xylem D. Secondary xylem E. Primary phloem

Biology & Microbiology