Opening Activity. Identify which era the following species might be first found in: 1) Single-celled pond scum 2) Lizard 3) Jellyfish 4) Pine tree 5) Bird 6) Sponge 7) Mammal 8) Flowering plant. DECEMBER 13TH , 2010. Classification. Speciation.
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Identify which era the following species might be first found in:
1) Single-celled pond scum
4) Pine tree
8) Flowering plant
DECEMBER 13TH, 2010
Speciation requires geographic isolation.
Otherwise, genes keep mixing and differences don’t get bigger.
Rivers, canyons, or mountains inbetween
Significantly different environments
Two species are different when:
They cannot mate
Their offspring are strongly selected against, limiting the number of hybrids.
Scientists used to categorize and name species on the basis of visible similarities and differences. Now they also include DNA mapping and other less obvious features.
Linnaeus is the scientist who created the naming system.
Each species gets two Latin names.
Zoology, cladistics, and phylogeny are all types of science that deal with categorizing species. They use a branching tree diagram to show divergence from a common ancestor.
Which species are
2) Which two species are the most different?
3) Which species is a common ancestor of both C and D?
4) Which direction is forward in time?
5) Under what conditions might have species B diverged into two different species?
Sub-Class or Order:
Frogs & Toads
Ch. 7.3 7.5 Short Notes
Attempt your science fair project and either identify and solve a problem or if it all works, gather your first trial’s worth of data.