FREQUENCY OF DELETERIOUS CHROMOSOMES AND ALLELISM BETWEEN LETHAL GENES IN JAPANESE NATURAL POPULATIONS OF <i>DROSOPHILA MELANOGASTER</i>

Evolution of Chilean colonizing populations of Drosophila subobscura: lethal genes and chromosomal arrangements

“…In D. melanogaster, Golubovsky (1966) found a non-negligible lethal allelism among populations, despite their spatial isolation (5 km). Similar results were obtained for this species in Japan by Watanabe (1969). Yamazaki et al (1986) found variations in rates of lethal allelism among different pairs of populations.…”

Chromosomal polymorphism in a Korean natural population of Drosophila melanogaster

“…As T.K. Watanabe (1969) was able to show, a frequency cline exists with respect to the frequency of lethals and semilethals in natural populations of D. melanogaster. The frequency cline is very similar to the cline for some inversions: low frequencies in Europe with an increase in frequency to the Far East.…”

HETEROZYGOUS EFFECTS ON VIABILITY OF SPONTANEOUS LETHAL GENES IN <i>DROSOPHILA MELANOGASTER</i>

“…The effective size of the population which Oshima (1963) studied can be estimated as about 1,800 on the basis of the parameters reported by Watanabe (1969), i.e., allelism rate =0.0348 and the frequency of lethal-carrying chromosomes=0.149. Wright (1941, 1943) and Wright, Dobzhansky, and Hovanitz (1942) This speculation may be consistent with the theory of evolution of species founded by Wright (Wright 1949;Kimura 1960) who has stated on the basis of his mathematical theory of population genetics that the most favorable condition for the evolution of species is that the species exists as many subpopulations which are incompletely isolated from one another.…”