PERSISTENCE OF A VISIBLE MUTANT IN NATURAL POPULATIONS OF &lt;i&gt;DROSOPHILA MELANOGASTER&lt;/i&gt;

Watanabe, Takao

doi:10.1266/jjg.44.15

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…This superiority may be largely due to the high fecundity and high fertility of B/+ females. This result is consistent with findings of Nickerson and Druger (1973) and Watanabe (1969).…”

Section: Pseudoobscurasupporting

confidence: 94%

“…Some genes in the inversions are rather deleterious in the homozygous state. The sex-ratio factor (SR) of D. pseudoobscura (Sturtevant and Dobzhansky, 1936), segregation-distorter (SD) of D. melanogaster (Sandler et al, 1959) and reduced bristle gene (rbl) of D. melanogaster (Watanabe, 1969) are associated with specific inversions and maintained in nature even though the homozygous fitnesses are low. Some persistent lethal and sterile genes are also found in association with polymorphic in-versions (Watanabe and Oshima, 1970;Oshima and Watanabe, 1973).…”

Section: Discussionmentioning

confidence: 99%

“…901 from the National Institute of Genetics, Misima, Japan. productivity was shown by Watanabe (1969). Productivity was measured as the mean number of offspring from a female, and therefore fecundity and fertility were included in it.…”

mentioning

confidence: 99%

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Fertility Genes in Natural Populations of Drosophila melanogaster. III. Superiority of Inversion Heterozygotes

Watanabe¹,

Watanabe²

1973

Evolution

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“…This superiority may be largely due to the high fecundity and high fertility of B/+ females. This result is consistent with findings of Nickerson and Druger (1973) and Watanabe (1969).…”

Section: Pseudoobscurasupporting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Fertility Genes in Natural Populations of Drosophila melanogaster. III. Superiority of Inversion Heterozygotes

Watanabe¹,

Watanabe²

1973

Evolution

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“…Thus the mutation and selection systems for these visibles should be different from those for the SD gene. It has been noted that the SD gene was often found in linkage with an inversion, In(2R)NS, while the rbl gene was with another inversion, In(2L)t (Watanabe, 1967(Watanabe, , 1969b. The frequency of the former inversion has been decreasing, while that of the latter has remained constant in the Katsunuma population (Table 2).…”

Section: Discussionmentioning

confidence: 98%

Further genetic studies on the Katsunuma population of Drosophila melanogaster.

Hatano¹,

Inoue

Watada

et al. 1999

Genes Genet. Syst.

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Changes in the genetic structure of the Katsunuma natural population of Drosophila melanogaster have been examined during the past 35 years. The frequency of recessive lethal genes on the second chromosome once increased from 15% to 30% in the early 1970s, then decreased to about 24% in the late 1970s, and thereafter showed no significant changes. Sterility genes, the frequency of which is always less than the lethals, showed a similar tendency. The SD (segregation distorter) mutant gene disappeared but some others such as rbl (reduced bristle) and bw (brown) persisted in the population. The frequency of inversion-carrying chromosomes gradually decreased in the period, such that the standard chromosome frequency in the second and third chromosomes increased from about 40% to more than 80%. Coincident with these frequency changes is the invasion of a transposable element P into the Katsunuma population. The P element should have invaded into Katsunuma in the late 1960s. It spread over the population apparently inducing deleterious mutations, causing the decrease in the allelism rate, and hence increasing the effective population size. Soon, however, most flies became resistant to the P element-mediated transposition as they began to harbor defective P elements. During the course of spreading, the P element must also have induced deleterious mutations on the polymorphic inversions, breaking up the heterotic gene complexes along the chromosomes, which probably caused the reduction in the frequency of inversion chromosomes. Temporal invasion of D. simulans, a sibling species of D. melanogaster, into Katsunuma occurred several times after 1978, and the species seems to have been settled since 1990. This, however, did not have any effect on the genetic structure of D. melanogaster population.

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“…Moreover, we also get a very interesting result: there is only a small average degree of dominance, except for population 5 (site 1) and 3 (site 2). Several authors (Stern et al 1952;Hiraizumi and Crow 1960;Crow and Temin 1964;Temin 1966;Watanabe 1969) have found for artificial populations of Drosophila melanogaster, which were examined for the viability effects in the heterozygous condition, an average of 2.5-3.0 percent in partial dominance. Temin (1966) did get in her data negative h values which meant that there were lethal genes that enhanced the viability of heterozygotes.…”

Section: Discussionmentioning

confidence: 99%

Population genetics in the American Tropics XVI. Data on partial dominance of recessives in Drosophila willistoni

Hoenigsberg

Ordóñez

Polanco

et al. 1982

Theoret. Appl. Genetics

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Through a series of genetic load studies made on 1) samples of Drosophila willistoni from two sites in Mesitas, Colombia, it was found that the relative contributions to the total, subvital and lethal loads reflect lethal equivalences (B/A) ratios which support more the balancing theory of population structure than the neutralist theory. Moreover, measurements of population size have revealed the existance of very small demes in local populations. Under such conditions we have calculated extremely small lethal equivalence ratios in demes where probably a great deal of consanguinity takes place. We are aware that under these conditions B/A ratios cannot be very good monitors of random load measurements and, therefore, suggest a change in the mathematical formulation that take into consideration the existance of small populations.Furthermore, it appears plausible that the degree of penetrance in the heterozygous condition changes as the population structure changes. We speculate that natural populations may have unknown selective mechanisms capable of guiding unknown dominance modifiers according to the intensity of selection.

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

Cited by 6 publications

References 9 publications

Fertility Genes in Natural Populations of Drosophila melanogaster. III. Superiority of Inversion Heterozygotes

Fertility Genes in Natural Populations of Drosophila melanogaster. III. Superiority of Inversion Heterozygotes

Further genetic studies on the Katsunuma population of Drosophila melanogaster.

Population genetics in the American Tropics XVI. Data on partial dominance of recessives in Drosophila willistoni

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