Practise Questions Midterm II W2013

B islands are more complex habitats than continental

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Unformatted text preview: amander species separate? a. Postzygotic barrier; hybrid inviability b. Postzygotic barrier; hybrid breakdown c. Prezygotic breakdown; hybrid sterility d. Prezygotic breakdown; hybrid incompatability 6. Islands are well known for having many endemic species – that is, species that are unique to that location. What is a likely explanation for this pattern? a. Colonizers encounter fewer competitors on an island, so they can diversity. b. Islands are more complex habitats than continental mainland, so they have more niches for specialization. c. Humans bring partly or fully domesticated species with them when they arrive on islands. d. The type of organism that’s a good colonizer has more than the average amount of genetic variability, so it’s more likely to undergo speciation. 7. If two species of lizards do not mate because their mating rituals differ greatly, this is known as a. ecological isolation. b. behavioural isolation. c. temporal isolation. d. mechanical isolation. 8. An example of mechanical isolation would be a. two organisms that are pollinated by different insects b. two organisms that have different habitats c. two organisms that have incompatible gametes d. two organisms that have different mating rituals 9. The biological species concept is inadequate for grouping a. Plants b. Parasites c. Asexual organisms d. Migratory animals 10. In order for speciation to occur, what is true? a. The number of chromosomes in the genome must change. b. At least one gene, affecting at least one phenotypic trait, must change. c. Large numbers of genes that affect numerous phenotypic traits must change. d. There does not need to be any genetic change. 11. Which of the following describes the most likely order of events in speciation? a. genetic drift, genetic isolation, divergence b. genetic isolation, divergence, genetic drift c. divergence, genetic isolation, genetic drift d. genetic...
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