Feb_9ReconstructEvolTrees

Feb_9ReconstructEvolTrees - Announcements Hand in your...

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1 Announcements • Hand in your Prelab Assignment • Quizzes EVERY week from now to end of semester Bring your laptop to lab this week • Next week – need Minitab on your computer for LAB – Need the license location? Type in: @minitablic.geneseo.edu Dr. John Jaenike University of Rochester, Department of Biology Adaptive Evolution Mediated by Endosymbionts In honor of Darwin Day 2009, the Department of Biology presents Drosophila in nature, feeding on a mushroom Wolbachia bacteria in a Drosophila oocyte Friday, February 13, 2009 1:30 pm, Newton 203 Come to the first: Biology Club Meeting Tuesday 2/10 at 8:30pm Bailey 135 Topics to be discussed include: - Biology Olympics (2/12) -Spring Trip to Washington, DC! -Fundraiser Ideas etc. All are welcome and we have a lot of exciting activities for this semester so get involved! QUESTIONS YOU SHOULD BE ABLE TO ANSWER AFTER THIS WEEKS LECTURE AND LAB. • What is a phylogenetic tree? • What is the difference between a phylogenetic tree and a dichotomous key? • Why do evolutionary biologists study evolutionary history and how is evolutionary history reconstructed? How do we see evolutionary change at the molecular level? Reconstructing Evolutionary Trees: Looking at Phylogeny
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2 Evolutionary Trees vs. Dichotomous Keys Dichotomous Key Uses measurable or objective morphological characteristics to identify an organism Characteristics used and proximity within a key may or may NOT reflect evolutionary relationships Evolutionary Tree Dichotomous keys do not necessarily reflect evolutionary relationships Dichotomous Key to Some Orders of North American Mammals 1a. At least 5 upper incisors on each side (10 total)… Marsupialia 1b. Fewer than 5 upper incisors on each side ….… 2 2a. No teeth present in at least anterior one-fourth of jaw . . Edentata 2b. At least incisors present in anterior fourth of lower jaw ………… 3 3a. Incisors of the separate sides of the upper jaw separated by an emarginationof the palate …………… Chiroptera 3b. Incisors of the upper jaw absent or in a single line .…… 4 4a. Skul with upper canines and incisors lacking, diastema present;cheek teeth solenodontor bunodont …. Artiodactyla 4b. Skul with incisors; diastema (gap between incisors and cheek teeth) either present or absent ……………. .… 5 5a. Diastema present ………. .……… ……………………… 6 5b.
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Feb_9ReconstructEvolTrees - Announcements Hand in your...

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