8. Natural selection acts (through predation) against banded water snakes on cer

Question

8. Natural selection acts (through predation) against banded water snakes on certain Lake Erie islands, favoring the uniformly light-colored snakes. The banded fom is very common on the nearby mainlands. Yet banded snakes are maintained in the island populations and not eliminated completely. This is probably due to a. mutation b. gene flow c. genetic drift d. natural selection 9. Genetic drift will tend to a. increase genetic variability both within and between populations b. decrease genetic variability both within and between populations c. increase genetic variability within populations but decrease genetic variability between populations d. decrease genetic variability within populations but increase genetic variability between populations 10. The Hardy-Weinberg equilibrium represents an idealized, evolution-free population in which the allele frequencies and genotype frequencies will not change over time. In order for this to happen, five conditions must be met: 1) there must be no mutation; 2) there must be no gene flow between populations; 3) the populations must be very large; 4) all mating must be random; and 5) there must be no natural selection. If one of these five conditions was violated, genetic change, asd thus evolution, would occur in the populations of subsequent generations. Suppose that only condition 3 were violated that the population was very small. In this situation, the evolution would probably be due to a. mutation b. migration c. genetic drift d. natural selection e. all of the above 11. What is a gene pool? a. a region of DNA found at a specific position on a chromosome b. the number of copies of an allele for a specific gene in a population ?.te total number of all the genes in a population d. none of the above 12. What is the Hardy-Weinberg principle? a. a model of population genetics that shows that evolution will occur if all of the conditions of the principle are met b. a model of population genetics that shows that evolution will occur if even one of the conditions of the principle is violated c. a model of population genetics that describes how evolution occurs in nature d. Both the first and third answers are correct

Explanation / Answer

8. Option D is correct.
Natural selection in favor of the banded snakes on mainland maintains its population.

9. Option D is correct.
Genetic drift increases inbreeding coefficient within populations. So, variability is decreased within the population. However, they vary a lot compared to the original population.

10. Option E is correct.
If the population is small, it is sensitive to all the listed parameters.

11. Option C is correct.
Gene pool refers to the total genetic composition of a population.

12. Option B is correct.

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