In a species of salamander, there are two forms, red and yellow. As the yellow form becomes less common due to predation and the red form more common, the yellow form becomes less likely to be eaten and more likely to survive and reproduce. The yellow form then becomes more common and roles of red and yellow forms reverse. This is an example of
A. disruptive selection.
B. balancing selection.
C. directional selection.
D. negative frequency-dependent selection.
Answer: D
You might also like to view...
Presuming that it takes several billion years of complex live to evolve in a stable environment, the stars most likely to currently have inhabited planets with favorable conditions for life are
a. G to K main-sequence stars. b. B to A main-sequence stars. c. G to K giants. d. white dwarf stars e. neutron stars.
Which organism would have a four-chambered heart to separate oxygenated from deoxygenated blood?
1.bird 2.fish 3.frog 4.turtle
In the Calvin cycle, the enzyme that catalyzes the capture of carbon dioxide and the formation of 3-phosphoglycerate is
A) phosphoglycerokinase. B) ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco). C) triose phosphate isomerase. D) ferredoxin-NADP+ reductase. E) glyceraldehyde-3-phosphate dehydrogenase.
Sports physiologists at an Olympic training center wanted to monitor athletes to determine at what point their muscles were functioning anaerobically. They could do this by checking for a buildup of _____.
a. ATP b. lactic acid c. carbon dioxide d. ADP e. oxygen