Which human populations have the highest levels of genetic variation?
A. European populations
B. African populations
C. Asian populations
D. Melanesian populations
E. North and South American populations
B
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In the late 1960's, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone comparing the species diversity in control plots with diversity in experimental plots from which he removed the top predator, sea stars
After 5 years, 15 species of intertidal invertebrates lived in the control plots, while the experimental plots were dominated by only two species, one mussel and one barnacle. Why did species diversity most likely remain high in the presence of a predator? A. The sea star kept the mussel and barnacle populations low enough to prevent competitive exclusion from occurring. B. The sea star kept the mussel and barnacles from developing a mutualistic relationship. That, in turn, kept their populations low. C. The mussel and the barnacle parasitized the sea star, keeping populations low enough to prevent competitive exclusion from occurring. D. The sea star developed a mutalistic relationship with the mussel and barnacle, keeping their populations low and preventing competitive exclusion from happening.
Which of the following structures becomes
part of the placenta?
a. chorion b. amnion c. blastocoel d. yolk sac e. more than one of these becomes part of the placenta
Two Drosophila are crossed several times, with a total number of offspring of 106 females and 48
males. There is too great a deviation from the expected 1:1 ratio for chance alone to account for the difference. What other factor could account for this difference? What will be an ideal response?
Describe the route of water through a sponge.
A. enters through the spongocoel into the osculum and exits via pores. B. enters through the pores into the osculum and exits via the spongocoel. C. enters through the osculum into the mesohyl and exits via the spongocoel. D. enters through pores into the spongocoel and exits via the osculum. E. enters through the osculum into the spongocoel and exits via pores.