When rediscovered at the turn of the century, Mendel's laws were found to be applicable to humans, but from the beginning they were fraught with problems. Sex-linked traits and linked genes defied Mendel's rules. Later, other exceptions were found, including sporadic cases, non-penetrance, variable expressivity, and preferential parental transmission.
In this book, Harry Ostrer observes that some of these problems can be explained by incomplete...