Practise Questions Midterm II W2013

If the prokaryotic flagellum developed from

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Unformatted text preview: b. Green algae are very closely related to the fungi. c. Land plants appeared first in the fossil record. d. Land plants and algae have a common ancestor. 32. A common ancestor is a. An ancestral organism very commonly seen in the fossil record. b. An ancestral organism shared by two or more descendant organisms. c. An ancestral organism that has no distinguishing features and is not unique. d. None of the above 33. Which of the following events would be the least likely to trigger an adaptive radiation event? a. Evolution of a new morphological feature b. Formation of a mountain range separating species. c. Colonization of a new habitat. d. Extinction of competitors. 34. All animals with eyes or eyespots that have been studied so far share a gene in common. When mutated, the gene Pax- 6 causes lack of eyes in fruit flies, tiny eyes in mice, and missing irises (and other eye parts) in humans. The sequence of Pax- 6 in humans and mice is identical. There are so few sequence differences with fruit fly Pax- 6 that the human/mouse version can cause eye formation in eyeless fruit flies, even though vertebrates and invertebrates last shared a common ancestor more than 500 million years ago. Based on this, which of the following is most likely to be true? a. Pax- 6 in all of these animals is not homologous; it arose independently in many different animal phyla due to intense selective pressure favouring vision b. The Pax- 6 gene is really not "one" gene. It is many different genes that, over evolutionary time and due to convergence, have come to have a similar nucleotide sequence and function c. The Pax- 6 gene was an innovation of an ancestral animal of the...
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This test prep was uploaded on 02/20/2014 for the course BIOLOGY 1001 taught by Professor Tamarakelly during the Spring '13 term at York University.

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