The effect of inbreeding on viability in Drosophila simulans.

Kosuda, Kazuhiko

doi:10.1266/jjg.55.307

Cited by 9 publications

(13 citation statements)

References 9 publications

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“…Therefore, the coefficient of inbreeding would be overestimated, particularly in the later stages of continuous inbreeding, and positive epistatic interaction would be underestimated (Kosuda 1972). The results in the present experiment are thus not inconsistent with these studies.…”

Section: Discussioncontrasting

confidence: 74%

“…To extend our understanding of the fitness function, a large body of experiment has been carried out for various fitness components (Dobzhansky et a1.1963;Malogolowkin-Cohen et a1.1964;Spassky et a1.1965;Crow 1968;Mukai 1969;Temin et al 1969;Kosuda 1971Kosuda , 1972Kosuda , 1980Clark and Feldman 1981;Sharp 1984;Seager and Ayala 1982;Seager et al 1982). It has become apparent that the male reproductive component of fitness may play a more important role than fitness variables in preadult stages and female fertility , in estimating the net fitness differentials in Drosophila (Anderson 1969;Sved and Ayala 1970;Bundgaard and Christiansen 1972;Marinkovic and Ayala 1975a, b;Petit et a1.1980;Brittnacher 1981;Sharp 1984;Kosuda 1983).…”

Section: Introductionmentioning

confidence: 99%

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Effects of chromosomal interaction on male mating activity in Drosophila melanogaster.

Kosuda

1985

The Japanese journal of genetics

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The epistatic interaction between the second and third chromosomes of D. melanogaster was quantified in male mating activity under no competition among males. The mean mating activity of the two-chromosome homozygote was 0.517±0.064.The expected value under a multiplicative model was 0.509±0.054. Coefficient of interaction, i, was calculated to be 0.008±0.129. k statistic, a new measure of epistasis devised by Seager and Ayala (1982), was 0.029±0.027, which is not significantly different from zero. It is concluded that there is no interchromosomal interaction between two major autosomes in male mating activity.

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Section: Discussioncontrasting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Effects of chromosomal interaction on male mating activity in Drosophila melanogaster.

Kosuda

1985

The Japanese journal of genetics

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“…Most available studies are focused on the effects of inbreeding on fitness components (Torroja, 1964;Kosuda, 1972;Wallace & Madden, 1965;Latter & Mulley, 1995; and on quantitative traits (Tantawy & Reeve, 1956;Lints, 1961). In D. subobscura, the effect of inbreeding on the rate of development, fertility (Hollingsworth & Maynard Smith, 1955), and the pattern of puffing activity in relation to chromosomal polymorphism (De Frutos, Latorre & Pascual, 1984) has also been studied.…”

Section: Introductionmentioning

confidence: 99%

Analysis of inbreeding in a colonizing population of Drosophila subobscura

1996

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An analysis of the effects of inbreeding on the genetic structure of a colonizing population of Drosophila subobscura has been carried out. Species of Drosophila, particularly D. subobscura, may have lethal alleles associated with chromosomal inversions and our aim was to assess the extent to which the genome is balanced in this way. The frequencies of chromosomal inversions were compared between a large population and a set of 72 lines that were maintained by brother-sister mating for 10 generations. Fisher's matrix method was used to calculate the expected homozygosity in these inbred lines for 5 allozyme loci (Aph, Hk-1, Lap, Odh, and Pept-1) used as markers of large chromosomal segments. Furthermore, the expected rates of fixation corresponding to these allozyme loci were also calculated. The results show that the amount of homozygosis observed did not differ significantly from expectations (with the corresponding loss of lines as a consequence of the reduction in viability). However, two deviations from strict neutrality were observed: there was a heterozygote excess at the Lap locus, and the frequency of the O5 inversion (always associated with a lethal gene in colonizing populations) was higher than expected.

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“…Interaction was significantly positive in one case and was significantly negative in another, whereas it was not significant in a further four cases. Different types of study to clarify intrachromosomal epi static interaction for various fitness components have been carried out in several species of Drosophila and other insects (Dobzhansky et al, 1963;Malogolowkin-Cohen et a!., 1964;Mukai, 1969;Kosuda, 1972Kosuda, , 1980. If different gene loci have independent fitness effects, then the relationship between the degree of inbreeding and the fitness depression should be linear on the logarithmic scale.…”

Section: Discussionmentioning

confidence: 99%

A further study of interchromosomal epistatic interaction in male mating activity of Drosophila melanogaster

Kosuda

1993

Heredity

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The interchromosomal epistatic interaction between second and third chromosomes was investigated for male mating activity of Drosophila melanogaster. The observed mating activity of double chromosome homozygotes is 0.526 0.044, whereas the expected one under the multiplicative model is calculated to be 0.511 0.038. These two male mating activities are in excellent agreement, indicating no interchromosomal epistasis. The coefficient of interaction, i, is quantified as -0.174 0.168. The magnitude of the k statistic, another index of epistasis, is 0.000 1 0.0267. Neither index of epistasis differs statistically from zero. The result also shows that there is little or no epistatic interaction between two major chromosomes. However, one interchromosomal synthetic sterility was found in 26 chromosome lines. These results are combined with those of Kosuda (1985) and the generality of epistatic interaction is discussed.

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The effect of inbreeding on viability in Drosophila simulans.

Cited by 9 publications

References 9 publications

Effects of chromosomal interaction on male mating activity in Drosophila melanogaster.

Effects of chromosomal interaction on male mating activity in Drosophila melanogaster.

Analysis of inbreeding in a colonizing population of Drosophila subobscura

A further study of interchromosomal epistatic interaction in male mating activity of Drosophila melanogaster

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