Online Open Genetics

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Free Genetics Textbook

(CC BY SA 3.0)

There are several versions of the text:
The first link is an older version with subjects grouped into traditional chapters. The second link is an updated version that has the chapters organized into individual lectures.  Appendices contain detailed modules about nomenclature and other skills along with interactive exercises.  The final link contains files used by Mount Royal University.

Drosophila Chromosomes (CC by SA4.0)