13. Suppose a population is in Hardy Weinberg equilibrium and the frequency ofth

Question

13. Suppose a population is in Hardy Weinberg equilibrium and the frequency ofthe "A"allele is 0.7. Which of the following statements is true? a. The frequency of the "a" allele is greater than the frequency of the "A" allele. b. The frequency of "Aa" genotype in the population is0A2. c. The frequency of aa" genotype in the population is 0.49. d. The frequency of AA genotype in the population is 0.14 14. Certain whale species were hunted to near extinction. With a moratorium on hunting them, their population sizes have exl Which of the following is a rue? panded. a. Whale species have a high reproductive rate. b. The populations may still be endangered because they may have little remaining genetic c, Hunting can "refresh" a whale species and increase its overall fitness. d. The populations have recovered and have demonstrated that populationshave the potential to recover completely from being driven to near extinction. e. Hunting is a form of stabilizing selection. 15. What enables a population to preserve and"hide" an allele? a. If the population is small. b. If the allele is recessive in a diploid population. c. If the allele is recessive in a haploid population. d. If the population experiences a bottleneck effect resulting in homozygous individuals for that allele. 16. Populations of bent grass can be found growing on heaps ofmining refuse heavily contaminated with metals such as lead and copper. The soil has become so contaminated that it is toxic to most plants, but the dense stands of bent grass growing over these refuse heaps have been shown to possess alleles of genes that make them resistant to high concentrations of lead and copper. But only a few meters from the contaminated soil can be found bent grass plants that are not resistant to these metals. Bent grasses reproduce primarily by cross-pollination, so that the resistant grass receives wind-bome pollen from the neighboring nonresistant plants. Yet they maintain their genetic differentiation because nonresistant seedlings are unable to grow in the contaminated soil. However in nearby uncontaminated soil, the nonresistant seedlings outgrow the resistant ones. The evolution of these resistant strains has taken place in fewer than 400 years since the mines were first opened. What type of natural selection is illustrated in this situation? a. directional selection b. diversifying selection c. stabilizing selection d. non-adaptive selection 17. Which of the following lines of evidence suggests that lungfishes evolved while Pangaea was intact a, modem lungfishes on different continents show similar patterms of behavior b. lungfishes are found today in Africa, Australia, and South America c, fossil lungfishes have been found on every continent except Antarctica d. All of the choices are correct. e. None of the choices are correct. 18. The similarities in function of hummingbird wings and the wings of a butterfly reflect a. homology but not analogy. b. homology but not homoplasy. c. analogy and homology.

Explanation / Answer

1)d.all living things are descended from a single common ancestor

2)c. taller redwood trees reproduce more successfully than shorter redwood trees.

3)a.cells

4)c. molecular biology

5)a contagious cancer is threatening the species with extinction.

13)

14)b. The populations may still be endangered because they have little remaining genetic variation

15)b. if the allele is recessive in a diploid organism

16)b. diversing selection

17)c.Fossil lungfishes have been found on every continent except Antarctica

18)analogy but not homology(the options are all wrong you given)

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