Polymerase chain reaction (PCR) has advanced an understanding of systematics because it allows
a. for analysis of morphological traits.
b. for analysis of small amounts of DNA from dried museum specimens and some fossils.
c. for the reconstruction of entire individuals from a small amount of DNA.
d. for the reconstruction of entire individuals from a small amount of RNA.
e. for the analysis of an entire genome from a small fragment of the genome.
B
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What will be an ideal response?
Sixty years of data from the Framingham Heart Study showed that people with low cholesterol had 50% more offspring, on average, than those with high cholesterol. Since it is known that cholesterol level is highly heritable, what can be concluded from this specific observation?
A. High cholesterol reduces an individual's fertility. B. The frequency of people with low cholesterol should increase in the U.S. population. C. Cholesterol level has a major effect on survival. D. Natural selection is largely nullified as an important evolutionary mechanism in modern human populations. E. Ethnic groups that traditionally have more children have a greater frequency of genes for low cholesterol.
Cavitation can occur when what happens?
A. Clouds block sunlight shining on the leaves. B. Root pressure pushes water up the xylem. C. Gas bubbles expand inside a tracheid or vessel member. D. Starch grains block the sieve tubes. E. Stomata get stuck closed.
Tool use is unique to humans
A. true B. false