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Teacher GuideThis guide correlates all the resources available on the Holiday Lectures on Science DVDs and throughout the BioInteractive.org website to specific Big Ideas, Enduring Understandings, and Essential Knowledge threads of the new AP® Biology Curriculum Framework.
Lecture(1 hr 28 sec) Dr. Page explains how successive inversions and deletions of the Y chromosome during mammalian evolution have reduced it to its present form—small and sparsely populated with genes.
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