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Chapter 18 Quiz

Chapter 18 Quiz - When the ratio of 2 or more phenotypes...

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The shift in population of peppered moths from 10% dark-colored moths prior to the advent of industry to 80% dark-colored moths after the advent of industry illustrates the process o microevolution and industrial melanism. Genetic drift is most likely to occur in a small population. If there is an absence of migration of breeding individuals among populations gene flow will not occur. Genetic drift may begin when a species become nearly extinct. Overharvesting, habitat loss, and earthquake may cause genetic drift. Small populations develop as a result of the founder effect and bottleneck effect which leads to genetic drift that affects gene pool frequencies. Misuse of antibiotics select for bacteria that are already resistant to antibiotics.
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Unformatted text preview: When the ratio of 2 or more phenotypes remain the same in each generation it is called balanced polymorphism. The form of speciation dependent upon a geographical barrier is allopatric. Sympatric speciation can occur due to hybridization. The different species of Galapagos finches developed from a single mainland ancestral finch through adaptive radiation. The rejection of finch suitors with the wrong type of beak is a behavioral type of isolating mechanism. Characteristics of animal genitalia or plant floral structures which make mating with other species impossible are forms of mechanical isolation....
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