EEMB2_Evo_Review (3)

EEMB2_Evo_Review (3) - EEMB Evolution Review Tuesday...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
EEMB Evolution Review Tuesday September 7 th 2010 Biological evolution: Change through space and time of living things. → Genetically-based change in a line of descent over time. Common misconception: “Man evolved from monkeys” Reality: We did not evolve from monkeys, but we do share a common ancestor. Orthogenesis → straight evolution = FALSE Individuals within populations show different forms of their traits (e.g. eye color, length of nose, etc) Traits determine morphology, physiology and behavior All of these things vary within a population and are passed on with different frequencies. History of evolutionary theory : Core comes from Ancient Greeks Aristotle Scala Naturae – Hierarchical system of commonplace life in its proper context “The Scale of Nature” - life as a fluid tree with each organism joined together; different organisms placed on tree according to external characteristics and “nobility” Important: (1) All life is tied together, (2) Life has order, and (3) Life is fluid (living and growing) in its nature. Stoic Philosophers – analysis of fossil record – represented creatures that existed in the past -What are the stoic philosophers mainly remembered for? Ideas don't change with the fall of Ancient Greece and rise of Rome Rome collapsed due to over-expansion, and was replaced by Christianity Radically different idea – all life was created at one time and is immutable Magnus – Removed humans from scale of nature Aquinas – Humans are divine and have a soul, therefore removal is justified Homunculus theory – soul transferred at fertilization Creationism – God created the Earth and all living things on it, Life is immutable and does not change, Earth is relatively young Questions about life Biogeography – Many plants and animals are unique to a given area, but certain organisms can resemble one another even if separated by large distances (rhea, emu, ostrich) Question – how did they get from point of creation to isolated parts of the earth? What
Background image of page 1

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

View Full DocumentRight Arrow Icon
was that significance of these differences? Comparative morphology – study of similarities/differences in body plans Arms, wings, flippers etc differ in size, shape, and function but are located in similar locations on body Questions – Why are animals that are so similar in some regards, so different in others? Why do some body parts have no function? Geology – Fossil remains of plants and animals Noticed that different fossils were found in different layers, and deeper layers had simpler fossils Questions – What did increasing complexity near surface represent? Were fossil layers separated temporally? Are the organisms related? Observations at odds with creationism - Species may have originated in more than one place - Species may be modified over time Buffon - Organisms change for the worse via “degeneration,” Earth is 70K years old. E. Darwin -
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

EEMB2_Evo_Review (3) - EEMB Evolution Review Tuesday...

This preview shows document pages 1 - 3. Sign up to view the full document.

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