Lecture 07 Outline Chapter 26

Lecture 07 Outline Chapter 26 - Bio II Lecture notes...

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

View Full Document Right Arrow Icon
Bio II Lecture notes: copyright: Dr. Will Crampton UCF Slide 1 (revision) Phylogenies based on derived characters (synapomorphies). Dot – evolution of new character Slide 2: (revision) Synapomorphies are “ Homologous” traits Homology – similarity due to shared ancestry. Homologous structures have the same evolutionary origin Slide 3: (revision) Homologous trait vs. Analogous trait (a.k.a. ‘homoplastic’ trait) Slide 4: (revision) Synapomorphies define a monophyletic group: contains ancestor and all descendents: Slide 5: (revision) Summary: Synapomorphic trait = homologous trait i.e. traits shared due to common ancestry Homoplasic trait = analogous trait i.e. traits shared, but not due to common ancestry … usually evolve by CONVERGENT EVOLUTION Slide 6: (revision): Synapomorphies – - Morphological - Molecular Slide 7: (revision) What are phylogenies based on? 1
Background image of page 1

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

View Full DocumentRight Arrow Icon
- morphological synapomorphies (for fossil and living organisms) - molecular synapomorphies (for living organisms only) Slides 8-10: See Fig. 26.11 pp. 543 Contrasting SYNAPOMORPHY (shared + derived) with PLESIOMORPHIC (ancestral) traits example: PHLUM CHORDATA = ANIMALS THAT POSSESS A NOTOCHORD ETC. Outgroup- taxon outside a closely related group – the Lancelet. Ingroup – the rest of the group, whose interrelationships we wish to reconstruct Character: vertebral column: State in the OUTGROUP is absent. The ancestral condition is ABSENT. Series of nested groups: each defined by a SHARED AND DERIVED CHARACTER. synapomorphies for vertebrae: vertebral column; for gnathostomes: hinged jaws. for tetrapods: 4 walking legs
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.

This note was uploaded on 11/08/2011 for the course BSC 2011C taught by Professor Klowden/crampton during the Fall '11 term at University of Central Florida.

Page1 / 9

Lecture 07 Outline Chapter 26 - Bio II Lecture notes...

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