Local and Seasonal Variations of Lethal Frequencies in Natural Populations of <i>Drosophila melanogaster</i>

ANALYSIS OF GENETIC VARIABILITY IN THE TWO MAJOR AUTOSOMES OF <i>DROSOPHILA MELANOGASTER</i> IN A NATURAL AND A CAGE POPULATION

“…The frequency of lethal second chromosomes was close to the mean frequency obtained by Oshima and others in Japanese populations of this species (Oshima and Kitagawa, 1961;Oshima and Watanabe, 1967;Minamori and Saito, 1964) from natural populations in the same locality during the past several years. From these results there are no seasonal changes of lethal frequency of the second chromosomes which Kosuda et al (1969) found in the natural populations of Katsunuma.…”

“…With regard to those of D. melanogaster in Japanese populations reported Oshima and Kitagawa (1961), Oshima and Watanabe (1967), Minamori and Saito (1964), and Kosuda, Kitagawa, and Moriwaki (1969). Oshima and Watanabe (1967) analyzed the deleterious genes on the second chromosomes extracted from natural populations in Kof u and Katsunuma localities every autum since 1963, and the mean frequency of lethal chromosomes was found to be 14.6 per cent, but the third chromosomes were at that time not analyzed.…”

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

“…At Hiroshima populations, Minamori et al ( , 1964 observed the frequency of deleterious chromosomes to be 11.6 and 12.5 per cent and the allelic rates between lethal genes to be 4.35 and 6.89 per cent, respectively.…”

PERSISTENCE OF A VISIBLE MUTANT IN NATURAL POPULATIONS OF <i>DROSOPHILA MELANOGASTER</i>

“…Ives (1945) extracted many visibles from American populations of D. melanogaster. Minamori and Saito (1964) also detected several visibles on the second chromosome in Japanese natural populations. This paper describes a recessive visible mutant, named rbl (reduced bristle), on the second chromosome which has been frequently extracted from natural populations at Kof u-Katsunuma since 1964.…”