Bio 106 Old Test 2

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Bio 106 Old Test 2
2012-12-12 00:16:48
Bio 106 test old

Bio 106
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  1. For biologists studying a large flatworm population in the lab, which Hardy-Weinberg conditions is most difficult to meet?
    d) mutation
  2. For biologist studying a small fish population in the lab, which Hardy-Weinberg condition is easiest to meet?
    c) no gene flow
  3. Wikelski and Romero (2003) found that large marine iguanas had higher reproductive success than smaller iguanas did. However, the large iguanas were generally in poor body condition because they could not eat enough; at higher temperatures their foraging efficiency improved, allowing them to eat more. Thus, Wikelski and Romero hypothesize that iduana size will _________ as global warming graduallyincreases air and water temperatures in the Galapagos islands.
    a) increases
  4. Currently the only predators of galapagos marine iguanas are galapagos hawks. Iguana body size is not correlated with risk of hawk predation, although small iguanas can sprint faster than large iguanas. If predators (e.g,. cats) that preferably catch and eat slower iguanas are introduced to the island, iguana body size is likely to ____ in the absence of other factors; the iguanas then be under _____ selection.
    c) decrease; directional
  5. Cystic fibrosis is a genetic disorder in homozygous recessive (ff) humans that typically causes death in the early 30's. Over time, we would expect the f allele frequency to ____ for this trait.
    c) decrease
  6. Three-spined sticleback fish (Gasterosteus aculeatus) show substantial heritable variation in gill-raker length. Fish caught in open water tend to have longer gill rakers and eat different foods than do those caught in shallower water. Longer gill rakers appear to function better for capturing open-water prey, while shorter gill rakers function better for capturing shallow-water prey. Which of the following types of selection is most likely to be found in a large lake (open water in middle and shallow water around the sides) with a high density of these fish?
    c) disruptive selection
  7. A biologist doing a long term study on a wild spider population observes increased variation in silk thickness. which of the following could the spider population be experiencing?
    c) disruptive selection
  8. In a small population of alpine foxes, you observe increased ear length over a 10-year period. Can you conclude that increase in ear length is advantageous in this population?
    b) No
  9. Which of the following is the most predictable outcome of increased gene flow between two populations?
    d) decreased genetic difference between the two populations
  10. Mutations is the only evolutionary mechanism that____.
    a) does little to change allele frequencies
  11. In 1986 a nuclear power accident in Chernobyl, USSR, led to high radiation levels for miles surrounding the plant. The high levels of radiation caused elevated mutation rates in the surviving organisms, and evolutionary biologists have been studying rodent populations in the Chernobyl area ever since. Based on your understanding of evolutionary mechanisms, which of the following most likely occured in the rodent populations following the accident?
    Mutation led to increased genetic variation
  12. why doesnt inbreeding depression, by itself cause evolution?
    It does not change populations allele frequencies
  13. In some Jacana Species, males take care of the eggs young and females compete among themselves for territories that contain one to several males. Female Jacanas are significantly larger than males. Which of these statements would you predict to be true of this bird species?
    1. Male jacana fitness is primarily limited by ability to take care of eggs and raise young
    2. Female jacana fitness is limited by the number of males in her territory with which a female mates
    3. Variation in reproductive sucess should be greater in male jacanas than in females
    4. Variation in reproductive sucess should be greater in male jacanas than in females
    5. Males and females have equal variation in reproductive success
    d) 1, 2, and 4
  14. A rare species of newt is being studied by a young evolutionary biologist. She observes that female newts lay unsually large yolky eggs, but they abandon their nests as soon as the eggs are laid. Males, on the other hand, defend the territory around the nest and regularly bring the baby newts insects to feed on. The males also sleep with the babies to keep them warmer during cool nigths. Which of the following statements is MOST LIKELY to be true of these newts?
    d) the males are choosy about which females to mate with

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