4-_Systematics - Systematics On Homology Chapterto Click 2 edit Master subtitle style Systematics Systematics the study of relationships postulated to

4-_Systematics - Systematics On Homology Chapterto Click 2...

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Click to edit Master subtitle style 9/14/10 Systematics: On Homology Chapter 2
9/14/10 Systematics Systematics - the study of relationships postulated to exist among species or higher taxa
9/14/10 Homology and Analogy Systematics is a tool that helps us determine homology (similarity derived from common ancestry) from analogy (artificial similarity not based on common ancestry) by building phylogenies (cladograms) Homology can also be defined as :Shared similarity due
9/14/10 Analogy; Convergence Convergence – the independent origin of similar attributes from a  dissimilar ancestral condition
9/14/10 Homology Turtl e Huma n Hors e Bir d Ba t Sea l Phalanges Humerus Radius and ulna Carpals; Metacarpals
9/14/10 Pierre Belon du Mans 1555 “equivalences
9/14/10 Georges Cuvier Correlation of parts; “fixity of species” Homology –the same organ in different organisms under every form and function Louis Agassiz (1857) Essay on Classification Three-Fold Parallelism Archetypes; No evolution required Not testable Richard Owen All similarity due to function
9/14/10 Hypothesis of Homology Turtl e Huma n Hors e Bir d Ba t Tai l Embryology; Ontogeny Gill pouch Bird Mammal
9/14/10 Ontogeny: Meckel’s Serres Law Meckel Serres Law – as an organism develops they pass  through the less complicated forms (pass through adult  stages of primitive groups) Recapitulation - Ernst Haeckel ( ontogeny recapitulates phylogeny ”) Hypothesis of Homology
9/14/10 Ontogeny:  Von Baer’s Law Von Baer’s Law –  the general characters of  the group to which an embryo belongs  appear in development earlier than the  special characters - terminal addition Hypothesis of Homology
9/14/10 Ontogeny:  Von Baer’s Law Von Baer’s Law –  the general characters of  the group to which an embryo belongs  appear in development earlier than the  special characters - terminal addition Gill pouch Bird Mammal
9/14/10 Hypothesis of Homology Turtl e Huma n Hors e Bir d Ba t Morphology; physical make-up, topology
9/14/10 Huma n Hors e Bir d Ba t Morphology-Transitions Hypothesis of Homology
9/14/10 Genetics- Amino Acid sequence of proteins Hypothesis of Homology

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