Lethality of the thalassemic homozygote will prevent the process from going to completion, and the thalassemia gene will stabilize at a frequency of s/(l + s). ... It is worth mentioning, incidentally, that the curve of approach. l 38 ...
The Genetics of Human Populations
A history and analysis of the Human Genome Project, the massive international effort to map each of the three billion molecules that make up human DNA
The "Book of Man," is the term used by Walter Bodmer and Robin McKie for the DNA that is the instruction set according to which all humans are made.
The Public Understanding of Science