The gallmaking fly larvae feeds on goldenrod plants, causing the plant tissue to produce a growth deformity called a
gall. How does parasitism of small galls by wasps and predation of fly larvae in large galls by birds result in a higher
percentage of medium sized galls?
What will be an ideal response?
ANSWER: If wasps preferentially parasitize fly larvae in small galls and birds preferentially eat fly
larvae in large galls, stabilizing selection favors medium-sized galls. That is, the opposing
forces of directional selection for small or large galls create selection for the gall-making
fly to make a higher percentage of medium sized galls.
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In animals that take in oxygen from their environment, glucose is broken down into carbon dioxide and water in a process called
A. anaerobic respiration. B. organic compound respiration. C. glucose respiration. D. aerobic respiration.
A population's carrying capacity is: a. all of these choices
b. when a population reaches equilibrium with the environment's sustainability. c. a constant rate. d. the exponential growth of a population.
Eric was working very hard in the dry, hot boiler room and sweating a lot. Under these conditions, which of the following might Eric be experiencing?
A) He has decreased hydrocortisone. B) He has increased oxytocin. C) He has increased antidiuretic hormone. D) He has decreased thyroxine.
Pr changes to Pfr after absorbing ________ nm wavelength of light.
Fill in the blank(s) with the appropriate word(s).