In this activity, students explore the relationship between developmental biology and macroevolution by focusing on how evolutionary changes in ontogeny can produce small-scale (within species) and large-scale (between species or major lineages) evolution of morphology. In Part A, students begin the activity by measuring skull length vs. braincase width in an ontogenetic sequence of an "ancestral" wolf species. They graph the resulting data then determine whether the relationship between the two is isometric or allometric. In part B, they choose three skulls of adult domestic dog breeds (available via online sources such as Skulls Unlimited). Measure the same two variables and compare these "descendent" data to the wolf "ancestral" data. In this way, they determine which dog breeds (e.g., pugs, bulldogs) appear to be paedomorphic and which (e.g., greyhounds) appear to be peramorphic.


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    Evolution,Higher Education,NSDL_SetSpec_380601,Undergraduate (Upper Division),Development/Growth and Form/Morphometrics,oai:nsdl.org:2200/20100502200117260T,Vocational/Professional Development Education,Life Science,NSDL



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