ANALYSIS OF GENETIC VARIABILITY IN THE TWO MAJOR AUTOSOMES OF &lt;i&gt;DROSOPHILA MELANOGASTER&lt;/i&gt; IN A NATURAL AND A CAGE POPULATION

Tsuno, Kendo

doi:10.1266/jjg.45.87

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…Matsudaira (1963) and Tsuno (1970) reported positive epistasis between two major chromosomes of D. melanogastey, calculating the regression of the observed viability of double homozygotes on the viability expected on the basis of independence.…”

Section: Discussionmentioning

confidence: 99%

“…It was shown that the intercept of an extension of the regression line on the Y-axis is at a considerable distance from the origin. The magnitude of epistasis could not be precisely compared based on the regression coefficient if the regression line dose not pass through the origin (Tsuno 1970).…”

Section: Discussionmentioning

confidence: 99%

“…There was no significant departure from random association (x2=3.49, d. f. =4, 0.3<P<0.4). Temin et al (1969) and Tsuno (1970) also found randomness of combination between the two autosomes of D, melanogaster. Table 2 gives segregation in the four classes in generation 4 both at F=0 and F= 1.…”

Section: Genetic Loadsmentioning

confidence: 93%

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SYNERGISTIC INTERACTION BETWEEN SECOND AND THIRD CHROMOSOMES ON VIABILITY OF <i>DROSOPHILA MELANOGASTER</i>

Kosuda

1971

The Japanese journal of genetics

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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SYNERGISTIC INTERACTION BETWEEN SECOND AND THIRD CHROMOSOMES ON VIABILITY OF <i>DROSOPHILA MELANOGASTER</i>

Kosuda

1971

The Japanese journal of genetics

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“…Several attempts to detect epistasis in viability of wild chromosomes of Drosophila have been made by analysing progeny ratios from crosses which yield flies isogenic for the second chromosome, the third chromosome or co-isogenic for both (Spassky eta!., 1965;Temin eta!. 1969;Kosuda, 1971;Tsuno, 1970). The general conclusion of these studies is that the double homozygote viability is slightly lower than expected from the single homozygote fitnesses, i.e., there is positive epistasis, although Temin eta!., (1969) found the epistasis to be insignificant.…”

Section: Introductionmentioning

confidence: 99%

“…The general conclusion of these studies is that the double homozygote viability is slightly lower than expected from the single homozygote fitnesses, i.e., there is positive epistasis, although Temin eta!., (1969) found the epistasis to be insignificant. Tsuno (1970) demonstrated that the strength of epistasis depended on the single homozygote fitnesses. Keller and Mitchell (1964) demonstrated X-autosome interactions in viability by crossing between inbred lines.…”

Section: Introductionmentioning

confidence: 99%

The estimation of epistasis in components of fitness in experimental populations of Drosophila melanogaster II. Assessment of meiotic drive, viability, fecundity and sexual selection

Clark

Feldman

1981

Heredity

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SUMMARYAn analysis of fitness components was performed on laboratory populations of Drosophila melanogaster bearing Curly and Plum marked second chromosome inversions with two genetic backgrounds. Selective differences between Curly, Plum, Curly-Plum, and wild phenotypes were partitioned into meiotic drive, viability, fecundity and mating success. Although no significant meiotic drive was detected, there were significant differences between genotypes in the other three components. Interlocus interactions in fertility and sexual selection components were measured, and statistics to quantify epistasis at these levels of fitness were devised. Significant fitness interactions between genes on the Curly and Plum inversions in viability, fecundity, and sexual selection were found. These results were qualitatively consistent with the maximum likelihood fitness estimates found previously. The expected allele frequency trajectories computed from the estimated components adequately fitted the observed selection trajectories.

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Effective population number estimates of laboratory populations ofDrosophila melanogaster

Malpica

Briscoe

1981

Experientia

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A sizeable fraction of the current information in population genetics comes from experiments with population cages of Drosophila melanogaster in which a high census (circa 5000 adults) is kept in order to obviate the influence of drift.We have estimated the effective population number in such cages by lethal complementation and our estimates are lower than the census by an order of magnitude.The estimation of the effective population number (Ne) by lethal complementation has a well established theoretical 24 5 basis , has been tested experimentally, and is of common use in population genetics ~-7. The expression for the estimate is 4(Is U-u)where U and u are the per chromosome and per locus mutation rates and lg is the allelic rate of lethal genes, which can be estimated bywhere Q is the observed frequency of lethal chromosomes in the population and Ic is the proportion of inviable, random heterozygous combinations of such chromosomes. The estimation was performed in populations kept for different times under cage conditions that maintain a steady census of about 5000 adults 8 (table). The populations were founded with wild caught individuals. Foundation stocks were over 500 inseminated females. Kaduna is known to be free of inversions, as seems to happen with populations kept under laboratory conditions19. Riudevella, Amherst and Stellenbosch samples were checked for inversions at the 3rd chromosome, the frequency of inversioncarrying 3rd chromosomes was below 6% in all of them.Values of Ic and Q were obtained for the 3rd chromosome and the usual values of U=0.005 and u= 10 -5 calculated for the 2nd chromosome were used 9-11, as the available data indicate that the lethal structure for the 2nd and 3rd chromosomes is very similar IrIs (J.M. Vassallo and J.M.M., unpublished results). The effective population numbers for the investigated populations were in the range 190-1235 (table).

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

Cited by 5 publications

References 15 publications

SYNERGISTIC INTERACTION BETWEEN SECOND AND THIRD CHROMOSOMES ON VIABILITY OF <i>DROSOPHILA MELANOGASTER</i>

SYNERGISTIC INTERACTION BETWEEN SECOND AND THIRD CHROMOSOMES ON VIABILITY OF <i>DROSOPHILA MELANOGASTER</i>

The estimation of epistasis in components of fitness in experimental populations of Drosophila melanogaster II. Assessment of meiotic drive, viability, fecundity and sexual selection

Effective population number estimates of laboratory populations ofDrosophila melanogaster

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