THE GENETIC POPULATION STRUCTURE OF BRAZILIAN DROSOPHILA WILLISTONI

It is well known that natural populations of Drosophila and of other sexually reproducing and cross-fertilizing organisms carry great stores of concealed recessive genetic variants. In particular, many of the chromosomes in these populations are lethal in double dose, because of the occurrence in them of recessive mutant genes or lethal gene combinations. As shown by Wright, Dobzhansky, and others, the study of these recessive lethals may give some valuable information concerning the genetic population structure. According to Wright (1943, 1948, and other works) the main population parameters are eight in number, namely:

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