Deforestation _____ the amount of minerals that run off from soil
a. increases
b. decreases
c. has no effect on
A
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Which component of a negative feedback mechanism does the brain or spinal cord represent?
a. response b. sensor c. integrator d. effector e. stimulus
The following is not a heavy metal toxin:
a. DDT. b. mercury. c. lead. d. zinc. e. copper.
Answer the following statements true (T) or false (F)
1. Molecular homologies indicate that living species evolved from a common ancestor or interrelated group of common ancestors. 2. Microevolution would be reflected in disequilibrium in Hardy-Weinberg. 3. In red-wing blackbirds, females tend to choose males with the most desirable territories. Males compete for territories. This is an example of intersexual selection combined with intrasexual selection. 4. Sickle-cell anemia is a disease that occurred from a point mutation in the replication of DNA. That mutation causes a change of an amino acid in ?-globulin. Nonrandom mating (not mating with any individual that has the allele for the mutation) could result in the removal of the mutated allele from a population. This would be an example of natural selection. 5. Neutral variation is supported by the observation that most changes in codons occur in the third position within the codon, which often has no effect on the sequence of amino acids in the protein.
The Galápagos Islands are inhabited by 13 species of Darwin's finches that evolved from a single species. This is an example of
A) clinal variation. B) adaptive radiation. C) directional selection. D) genetic drift.