L2 Ideas About Evol 3-11

L2 Ideas About Evol 3-11 - 4/7/11 Lecture 2: Ideas About...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
4/7/11 1 Classical Greeks - Aristotle (384-322 B.C.) – Felt that species are fixed and permanent – Organisms can be arranged from simple to complex - most imperfect to most perfect – Called this arrangement - Scala Naturae or Scale of Nature Lecture 2: Ideas About Evolution- Historical overview Historical Overview - Aristotle Scale of Nature imperfect to perfect these ideas persisted for the next 2,000 years but evolution has no direction or final goal, not ladder-like Historical Overview Carolus Linnaeus (1707-1778) – founder of modern taxonomy • Taxonomy - classification and naming of organisms – place diversity of life into order – felt species were permanent creations – felt that by classifying species, was revealing God ` s plan – the system is non-evolutionary Historical Overview Linnaeus Two main aspects of system: 1. The binomial - two part name for every organism; scientific name • consists of genus and species name Examples: Felis concolor - Mountain Lion Homo sapiens - Human Canis familiaris - Domestic Dog Historical Overview Linnaeus Two rules to use when writing a binomial: – both names are always italicized or underlined – genus name is capitalized, species name is not capitalized Example: Felis concolor - mountain lion Historical Overview Linnaeus Two main aspects of system: – 1. Binomial (scientific name) – 2. Hierarchy organisms placed into different categories that fit into other categories
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4/7/11 2 Historical Overview Linnaeus - Hierarchical Classification taxonomic rank name Kingdom Animalia Phylum Chordata Class Mammalia Order Carnivora Family Felidae Genus Felis Species Felis concolor Historical Overview Linnaeus Although Linnaeus felt that organisms were fixed and did not evolve, his idea of categories fitting within categories is consistent with the ideas of evolution. Historical Overview Idea that species are fixed was prevalent. But, fossil record presented one challenge to this idea. Fossils= remains of past life recognition -fossils belong to species that no longer exist. Historical Overview Georges Cuvier (1789-1832) – founder of comparative anatomy – was struck by consistency of plan & organization in animals bodies Vertebrata Mollusca Articulata Radiata Based on his studies, Cuvier grouped animals into four distinct general plans or branches Historical Overview Cuvier Historical Overview Cuvier – Different layers in the fossil record. – Each layer had a unique group of fossils – The deeper the layer, the more dissimilar the fossils were to current organisms Also studied fossils - founder of Paleontology
Background image of page 2
4/7/11 3 Historical Overview Cuvier If extinction could occur, was idea of evolution (appearance of new creatures) also possible? Perhaps species weren
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

L2 Ideas About Evol 3-11 - 4/7/11 Lecture 2: Ideas About...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online