The observation that most pureblood Native Americans have type O blood is best explained by _____  

A.  gene flow.
B.  assortative mating.
C.  genetic drift.
D.  a founder effect.
E.  frequent mutations.


D.  a founder effect.

Biology & Microbiology

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What structure releases the chemical cues that help guide a developing pollen tube toward an ovule?

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a. phosphodiester b. peptide c. glycosidic d. hydrophobic

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Briefly discuss the cardiac cycle. Include the time of the phases and what occurs in the atria and the ventricles. Define and use the terms systole and diastole.

What will be an ideal response?

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If one is planning to use multiple regression to summarize how the variables X1, X2, X3 explain the variation in Y, how many parameters are involved in estimating the linear regression?

A. 2 B. 3 C. 4 D. 5

Biology & Microbiology