Selection for Sexual Isolation Between Geographic Forms of Drosophila mojavensis. I Interactions Between the Selected Forms

Evolution ◽  
1987 ◽  
Vol 41 (1) ◽  
pp. 37 ◽  
Author(s):  
H. Roberta Koepfer
Keyword(s):  
Sexual Isolation ◽  
Drosophila Mojavensis ◽  
Selection For

scholarly journals A test of sexual isolation in Drosophila

1966 ◽  
Vol 8 (2) ◽  
pp. 181-187 ◽  
Author(s):  
Forbes W. Robertson
Keyword(s):  
Assortative Mating ◽  
Sexual Isolation ◽  
Genetic Differences ◽  
Genetic Changes ◽  
Positive Assortative Mating ◽  
Selection For

1. A test is described for the development of sexual isolation between a wild and a derived population of D. melanogaster adapted to a new diet, containing EDTA. Other experiments had shown that adaptation to the new diet involved genetic changes in all chromosomes. Also fitness was reversed on the alternative diets under crowded competitive conditions.2. In three replicated trials flies from each population were used to establish paired cage populations, supplied with the medium to which each was adapted, and the pairs of cages were joined to allow restricted immigration between them. The experiment was run for about twenty-five generations.3. After fifteen and twenty-five generations, flies were collected from each cage to provide eggs which were cultured on the alternative diets to determine how far the members of pairs of populations differed from each other and from the foundation population. There were striking differences between the sub-populations and the parent populations, attributable to immigration between the former. Judged by the differences in performance between the sub-populations, genetic differences persisted but these were minor compared with the differences between the parent populations.4. Tests of preferential mating on the part of flies from paired sub-populations were entirely negative.5. Fourteen generations of selection for positive assortative mating failed to provide evidence of sexual isolation between the two basic populations, adapted to different diets.6. From these and other experiments it is inferred that sympatric divergence is improbable in a species like D. melanogaster.

scholarly journals Genetic divergence in M. Vetukhiv's experimental populations of Drosophila pseudoobscura 1. Rudiments of sexual isolation

1964 ◽  
Vol 5 (1) ◽  
pp. 150-157 ◽  
Author(s):  
Lee Ehrman
Keyword(s):  
Genetic Divergence ◽  
Sexual Isolation ◽  
Drosophila Pseudoobscura ◽  
Selection For ◽  
Experimental Populations

Weak but statistically significant sexual isolation has been demonstrated among Vetukhiv's six experimental populations of Drosophila pseudoobscura, all originally descended from founders taken from cultures of the same hybrids from four geographic localities. These six populations were maintained separately for almost 4½ years and then tested for the existence of sexual isolation. The sexual isolation has arisen in the absence of any selection for isolation, evidently as a by-product of genetic divergence.

Sexual Isolation among Populations of Drosophila mojavensis

Evolution ◽  
1991 ◽  
Vol 45 (6) ◽  
pp. 1525 ◽  
Author(s):  
Therese A. Markow
Keyword(s):  
Sexual Isolation ◽  
Drosophila Mojavensis

scholarly journals SELECTION FOR MATING RELUCTANCE IN FEMALES OF A DIPLOID PARTHENOGENETIC STRAIN OF DROSOPHILA MERCATORUM

Genetics ◽  
1973 ◽  
Vol 75 (3) ◽  
pp. 541-555
Author(s):  
Hiroshi Ikeda ◽  
Hampton L Carson
Keyword(s):  
Genetic Variance ◽  
Sexual Isolation ◽  
Female Offspring ◽  
Drosophila Mercatorum ◽  
Selection Experiments ◽  
Selection For

ABSTRACT A diploid parthenogenetic strain of Drosophila mercatorum was outcrossed to produce genetic variance among the impaternate female offspring. Selection experiments were carried out for reluctance of the parthenogenetic females to mate. After only two cycles of selection, a parthenogenetic strain which is significantly less receptive to males from three different bisexual strains was obtained. It was also found that there is some degree of sexual isolation among the three bisexual strains used. The results support the idea that selection can render a newly produced diploid parthenogenetic strain behaviorally different from its bisexual ancestor. This appears to provide a framework which can explain the natural coexistence of diploid bisexual and diploid parthenogenetic biotypes in some species of insects.

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