Which of the following would a biologist describe as microevolution?
A) the formation of new species
B) the extinction of species
C) dramatic biological changes, such as the origin of flight, within a taxon
D) a change in the gene pool of a population from one generation to the next
Answer: D
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Why does genetic drift have more of an impact on evolution of small populations than large ones?
A. Small populations have greater rates of mutation. B. Small populations are affected more by stabilizing selection. C. Small populations are more affected by random effect. D. Small populations are more prone to migration. E. Small populations are less affected by mutations.
In order to be useful for constructing a phylogeny, a character must:
A. have a genetic basis. B. vary within a species. C. have only one state. D. show the same state across several species. E. All of the answer options are correct.
Thalassemia is a recessive blood disease caused by reduced synthesis of one of the globin genes
While SCD is a mutation in the structure of hemoglobin, thalassemias can also be caused by mutations in the regulatory elements, causing too little globin to be produced and resulting in anemia. You've designed a DNA probe that you want to use to screen a family for a rare mutation in the ?-globin gene that causes thalassemia. First you will use the probe for northern blotting. What information will the northern blot tell you? A) whether the mRNA for ?-globin is being translated into functional proteins in a given cell population B) whether the amount of the ?-globin gene being transcribed (mRNA levels) is within normal range C) the size of the mRNA being transcribed D) the presence of a particular mutation by restriction fragment analysis E) both B and C are correct
In what ways are hydrogen bonds and ionic bonds similar?
A) Both are based on attraction between atoms that carry differences in electrical charge. B) Both are based on attraction between two atoms where each carries a positive charge. C) Both involve an even sharing of electrons between atoms. D) Both are based on attraction between two atoms where each carries a negative charge. E) Both are based on repulsion between atoms that carry differences in electrical charge.