DEVELOPMENT-EVOLUTION2010

DEVELOPMENT-EVOLUTION2010 - Midterm Exam : Tuesday Feb. 9 !...

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Midterm Exam : Tuesday Feb. 9 Review Session : Thursday Feb. 4 4-6 pm Math Sciences 5200 Please come ! 6 MAJOR LINES OF EVIDENCE 1) DIRECT OBSERVATION 2) COMPARATIVE ANATOMY 3) EMBRYOLOGY/DEVELOPMENT 4) BIOGEOGRAPHY 5) FOSSIL RECORD (PALEONTOLOGY) 6) BIOCHEMISTRY : DNA
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PURPOSE OF THE LECTURE: 1) Explain how the evidence from embryology supports the theory of evolution as descent with modi±cation 2) Look at how changes in development can produce dramatic shifts in morphology – and thus may explain some signi±cant leaps in the evolution of life. 3) Examine some anatomical oddities that are best understood as the result of descent with modi±cation, rather than intelligent design. FOUR PREMISES OF DARWIN’S THEORY OF EVOLUTION
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A culinary analogy: • Genes = chefs, • Products = food, • Diners = natural selection. ONTOGENY is the development and growth of an individual from zygote to adult.
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During ontogeny, growth rates of structures vary with age. Unknown to most historians, William Tell had an older and less fortunate son named Warren.
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ONTOGENY = The development and growth of an individual from zygote to adult. • 1) Ontogenies usually involve unequal growth of some parts relative to others. • 2) Changes in growth rate or timing can be due to relatively small genetic changes but have profound morphological consequences. • 3) HETEROCHRONY (=different time): changes in the growth rate and timing of initiation or cessation of growth. " Ontogeny is the brief and rapid recapitulation of phylogeny, dependent on the physiological functions of heredity (reproduction) and adaptation (nutrition.).” Ernst Haeckel (1834-1919) "Ontogeny recapitulates phylogeny.” (The Biogenetic Law .) Ontogeny = development Recapitulate = repeat in concise form, to summarize Phylogeny = the evolutionary history of a species.
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Fish Amphib. Bird Rabbit Human Two big problems with the biogenetic law: • 1) the fact that a strict interpretation is clearly wrong, and • 2) the fact that it suggests that evolution can occur only by adding on to ontogenies – and not by shortening them.
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This note was uploaded on 03/11/2010 for the course GE CLST 70B taught by Professor Morris,m.r./friscia,a.r./moldwin,m.b./vanvalkenburgh,b during the Winter '10 term at UCLA.

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DEVELOPMENT-EVOLUTION2010 - Midterm Exam : Tuesday Feb. 9 !...

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