An initial, but extensive, study of a breeding population of gerbils shows that the allele for fluffy fur (F) is dominant and occurs with a frequency of 0.8, whereas the smooth fur allele (f) occurs with a frequency of 0.2. Several years later, another study is conducted which shows that the frequency of gerbils displaying the smooth fur phenotype is 0.4. Which statement is true?
a. The population exhibits Hardy-Weinberg equilibrium.
b. The proportion of smooth-furred gerbils has doubled.
c. Some kind of evolutionary force acted on the population.
d. The allele for smooth fur has become dominant.
c. Some kind of evolutionary force acted on the population.
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An area that experiences very little change in species composition:
A. has probably been recently disturbed. B. is likely comprised of mostly plant species. C. is a long way from reaching the climax community. D. is most likely comprised of mostly Kstrategists. E. is likely comprised of mostly r-strategists.
The pigment in hemoglobin contains the
mineral ___ to which oxygen binds.
a. magnesium b. iron c. calcium d. copper e. zinc
In estimating the linear probability model for whether an individual clicked through on an advertisement based off how much time the individual spent on the website, which of the following conditions must hold from the resulting regression (ClickThroughi = ?0 + ?1TimeSpenti + Ui)?
A. The sum of the residuals will be zero. B. The estimate for ?1 will be negative. C. All the predictions will fall between 0 and 1. D. The estimate for ?0 will be positive.
Why might an HIV test be negative within the first two to three weeks of an HIV infection?
A. because there are no symptoms B. because there is no HIV in the blood C. because there are no opportunistic infections yet D. because the CD4 T-cell count is above 500 cells/mm3 E. because there are no detectable levels of HIV antibodies in the blood