Previous test 2 with answers post.pdf - ANSWERS ARE AT THE END Part%A%MULTIPLE%CHOICE"Choose"the"ONE"BEST"answer"Answer"on"the"scantron"sheet

Previous test 2 with answers post.pdf - ANSWERS ARE AT THE...

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ANSWERS ARE AT THE END Part A: MULTIPLE CHOICE . Choose the ONE BEST answer. Answer on the scantron sheet provided. One mark each (total = 27 marks). 1.The evolution of ___________________ has been experimentally observed in separatedpopulations of fruit flies. a) behavioural isolationb) postzygotic isolationc) temporal isolationd) habitat isolation 2.Chimpanzees and bonobos (= sister species) are the closest living relatives of humans.Gorillas, orangutans and gibbons are our second, third, and fourthLclosest relatives,respectively.Which of the cladograms below correctly depicts this information? (Hu =human, Ch = chimp, Bo = bonobo, Go = gorilla, Or = orangutan, Gi = gibbon). Gi Or Go Bo Ch Hu Gi Or Go Bo Ch Hu Gi Or Hu Ch Bo Go
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2 3.The largest mass extinction of the Phanerozoic Eon c) occurred at the end of the Paleozoic Era d) All of the above 4. What genetic mutation is thought to have contributed to the reproductive isolation of human ancestors from chimpanzee ancestors? a) An alteration in the regulation of a Hox gene b) The duplication of a region of a chromosome c) A fusion of chromosomes d) A chromosomal inversion 5.Two different species occasionally attempt to mate with each other. When they do,fertilization takes place but none of the offspring reach reproductive maturity. Thegene pools of these species are isolated by 6.NewlyLformed volcanic rocks contain many crystalline minerals, including zircon.Zircon crystals incorporate atoms of uranium into their structure, but exclude atoms oflead when they first form. Over time, uraniumL235 atoms decay to produce leadL207atoms; the latter accumulate inside the crystal. The halfLlife for this decay process isroughly 700 million years.A piece of volcanic ash is found alongside a fossil. The ash contains zircon crystalsin which there is one atom of uraniumL235 for every fifteen atoms of leadL207. Howold is the ash (and the fossil)? a) 700 million years.b) 1.4 billion yearsc) 2.1 billion yearsd) 2.8 billion yearse) 3.5 billion yearsf) 4.2 billion years
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