Genomic analyses of the apple- and hawthorn-feeding races of Rhagoletis suggest that genetic divergence between the
two species has largely been driven by ____ selection, a diversifying form of natural selection.
a. disruptive
b. directional
c. stabilizing
d. artificial
e. sexual
ANSWER: a
You might also like to view...
Recall that during the Paleozoic Era, atmospheric CO2 levels decreased. Why?
A. New, extensive mountain ranges formed and chemical weathering decreased. B. Earth's plate tectonics changed dramatically, and subduction increased. C. Photosynthetic, woody plants first appeared during this period. D. Volcanism decreased during this period.
Reptiles are __________ (cold-blooded animals) with scales. Fill in the blank(s) with the appropriate word(s)
In pea plants, round peas are dominant (R) and shriveled peas are recessive (r), and yellow peas (shown as light gray in the Punnett square) are dominant (Y) and green peas (dark gray) are recessive (y). Using this information and the partial Punnett square shown, what is the phenotypic ratio of the offspring pea plants in this Punnett square?
A) 12:1:1:4 B) 9:3:3:1 C) 3:3:1:1 D) 1:1:1:1
Hiv
A. appears to cause AIDS. B. is an RNA virus. C. destroys T helper cells. D. makes the patient vulnerable to infections, especially those caused by opportunists. E. All of the choices are correct.