Which of the following is true regarding a balanced polymorphism?
A. The frequency of alleles is not changing over time
B. The homozygous condition for the alleles is not advantageous to the organism
C. The population (or species) occupies a heterogeneous environment
D. An example in humans is sickle-cell anemia
E. All of the answers are correct
E
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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.
Answer the following statements true (T) or false (F)
1.Lodgepole chipmunks have moved to higher elevations in the last century as temperatures at Yellowstone have climbed. 2.Fish ladders can help fish populations deal with obstructions created by dams. 3.If you were preparing a generalized plan to conserve biodiversity, besides habitat destruction, you would list eutrophication as the primary threat to biodiversity. 4.Overexploitation is harvesting a species faster than it can reproduce. 5.Smog, among other things, indicates change in large-scale chemical cycles.
Which government agency serves as the ultimate storehouse for statistical data related to infectious disease?
A) Food and Drug Administration B) Centers for Disease Control and Prevention C) Census Bureau D) Federal Bureau of Investigation
The transfer of electrons from chlorophyll a molecules to the primary electron acceptor is an example of a/an:
A) synthesis reaction. B) redox reaction. C) light reaction. D) absorption reaction.