2. Using the Galapagos finches as an example, answer the following questions: I. Why are there only three species of finches on the mainland of South America and up to 16 different species of finches on the Islands? II. Describe the mechanism by which the original population of finches arrived on the islands.
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- 4. Bird guides once listed the myrtle warbler and Audubon’swarbler as distinct species. Recently, these birds have beenclassified as eastern and western forms of a single species,the yellow-rumped warbler. Which of the following piecesof evidence, if true, would be cause for this reclassification?(A) The two forms interbreed often in nature, and theiroffspring survive and reproduce well.(B) The two forms live in similar habitats and have similar foodrequirements.(C) The two forms have many genes in common.(D) The two forms are very similar in appearance.2) In a particular island, the environment is semi-arid. There is a lizard population with a lot of variation for color. Normally, the light sandy color and golden colored lizard flourished because they escaped predation, while others were barely surviving. However, in recent years, a lot of rain has brought about a lot of vegetation. Which variation of lizard will now flourish in the area? * A) white B) Brown C) Green D) Red1) How did the removal of sea otters affect the population of two other organisms? Please explain. (grey means they are no longer available in that ecosystem).
- 9) This chart shows the beak length of a population of finches in the Galapagos. The island was faced with a five year drought that made it difficult for birds to get water. If natural selection occurs, how would you predict the bird beak lengths to change? A) Only those with shorter beaks would survive. B) The population would not really change much. C) Only those with the longest beaks would survive. D) Those with medium-long beaks would increase most. Not Graded1) In allopatric speciation, geographic separation of two populations a.reduces the relative fitness of hybrid offspring. b.is sufficient for speciation to occur. c.allows gene flow between them. d.inhibits gene flow between them.Which of the following could be an example of microevolution? a. a slight change in a bird populations color due to a smallgenetic change in the population b. large differences between fossils found near the groundsurface and those found in deep rock layers c. the sudden disappearance of an entire genus d. the direct evolutionary link between living primates andhumans e. a flood that drowns all members of a population
- In the model of allopatric speciation, the geographical separation of two populations: a. is sufficient for speciation to occur. b. occurs only after speciation is complete. c. allows gene flow between them, d. reduces the relative fitness of hybrid offspring. e. inhibits gene flow between them.#2: Which of the following sexual selection hypotheses would apply to a species in which elaborate male traits have evolved because females have preferences for these traits, and female preferences have spread through the population simply because they are genetically correlated with the preferred male traits? (chose one answer) a. Chase-away sexual selection b. Indicator "good genes" model c. Fisherian "runaway" sexual selection d. Antagonistic co-evolution e. The parasite hypothesis1. What are the reasons why Philippine tarsiers cannot be found in Cebu despite it being near to Bohol, instead it found in Samar, Leyte, and Mindanano? Discuss the reason and explain it. Do not just copy it from somewhere, please.
- 6) If a sudden frost kills many small birds in a population, but only a few medium- and large-sized ones, which type of selection is likely operating? a.Intersexual b.Directional c.Disruptive d.Stabilizing1)Based on the given data, come up with (and write down) a hypothesis that might explain the range expansion of this species between 1850 and 2000? Discuss how you arrived at this hypothesis based on available data.8) What data would suggest that a species evolutionary history includes sexual selection as a mechanism that helped shape the species? A) If males and females are significantly different from each other (sexual dimporphism) B) If some males reproduce with multiple females while other males do not reproduce C) If males engage in "risky" behavior D) If males and females form different social groups (i.e. herds are formed from either males or females but not both)