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Lab 7. Overview  Instructor collects lab. 6 write up and checks pre-lab. in lab notebook  Discussion of “Mating Game” write up  Taxonomic Keys, Conifers,

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Presentation on theme: "Lab 7. Overview  Instructor collects lab. 6 write up and checks pre-lab. in lab notebook  Discussion of “Mating Game” write up  Taxonomic Keys, Conifers,"— Presentation transcript:

1 Lab 7. Overview  Instructor collects lab. 6 write up and checks pre-lab. in lab notebook  Discussion of “Mating Game” write up  Taxonomic Keys, Conifers, & Phylogeny Overview.  Use key to identify conifers.  Construct two phylogenies from lab manual.  Complete Simbio Flowers & Trees workbook in-class. (Workbook due Lab 8, may turn in early.)  Examine plant cultures.  Discuss independent project with instructor.

2 Taxonomic Keys  Taxonomic Key = tool designed to allow a user identify organisms by focusing the user on specific variable characteristics. (It does NOT identify evolutionary relationships)

3 Conifers

4 Phylogeny  Phylogeny / Phylogenetic Tree = diagram of the pattern of evolut. descent of a group of species derived from an ancestral species.  Monophyletic group (Clade) = an ancestral species and all of its descendants

5  Speciation and microevolution cause a pattern of characteristics that reflects their descent.  Uniquely derived characteristics identify monophyletic groups.  Derived trait - a newly evolved characteristic; evidence of shared ancestry.  Ancestral trait - the trait that changed to a derived trait; NOT evidence of shared ancestry Phylogeny Reconstruction

6 Fly Bee Spider Round- worm Earth- worm Jellyfish - OG molting legs wings symmetry flagella on sperm present absent present absent present absent present bilateral present absent present absent present absent presentradial

7 Phylogeny Reconstruction Fly Bee Spider Roundworm Earthworm wings legs bilateral molting no flagella on sperm

8 Today’s Activity Reminders  READ the instructions (  ) in the manual.  Be sure you could identify a conifer specimen using the key in the lab manual before you leave.  Be sure you could construct a phylogeny based on data as provided in the manual before you leave.  You must work with your partner on your Flowers & Trees workbook in lab. If you do not finish you may turn it in next lab period.  Your instructor needs a revised ind. proj. hypothesis, supplies list, and trial run plan before you leave.


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