For this exercise you will visit the Eukaryotes page the Tree of
Life website. The Tree of Life initiative is a global effort to
understand the phylogenetic relationships of all organisms on the
planet. Contributions to this effort come from hundreds of labs
worldwide, each working on a specific group of organisms, and the
results are summarized at the Tree of Life website. As new information
is produced and a
consensus emerges about these relationships, the tree is augmented and
refined to reflect this new information. Much of the newest informaton
about groups is emerging from the study of molecular data. Visit the
site, read the information there and be prepared to answer the
following questions concerning the
phylogeny, biology and evolution of the major groups of eukaryotes.
1.(2) What are eukaryotes? How are they different structurally from
other organisms? How are they different nutritionally?
2.(2) What are the defining structural features of
all eukaryotes that suggest to us what their original common ancestor
3.(2) What eukaryote organelles are assumed to have arisen by
endosymbiosis? From what endosymbiotic association did each organelle
is the evidence for this?
4.(2) Current classifications, based on both ultrastructural and
molecular data, recognize various large supergroups of eukaryotes. Each
supergroup is remarkably diverse morphologically and ecologically, but
each is apparently monophyletic. What does this mean? In what
supergroups are the three most familiar kingdoms of multicellular
organisms, the fungi, animals and plants? Are there supergroups that
are primarily unicellular?
5.(2) What are opisthokonts? What major groups of organisms are included in this phylogenetic group and how are they related to one another?