I recently used this book in an undergraduate genetics course that was taught by a M.D./Genetics Counselor who, after the first month or so of using the book and the accompaning powerpoint presentation got so frustrated that told us not to bother reading the book anymore. An example would be the improper use of the Chi Square test that the book uses and instructs.If you are an instructor save yourself the trouble of dealing with a book with so many errors in it.