Chromosomal Polymorphism and Sexual Isolation in Sibling Species of the Bocainensis Subgroup of Drosophila

Evolution ◽  
1956 ◽  
Vol 10 (3) ◽  
pp. 288 ◽  
Author(s):  
Francisco M. Salzano
Keyword(s):  
Sibling Species ◽  
Sexual Isolation ◽  
Chromosomal Polymorphism

scholarly journals Genetics of sexual isolation in male hybrids of Drosophila simulans and D. mauritiana

1996 ◽  
Vol 68 (3) ◽  
pp. 211-220 ◽  
Author(s):  
Jerry A. Coyne
Keyword(s):  
Genetic Analysis ◽  
Y Chromosome ◽  
Sibling Species ◽  
Previous Analysis ◽  
Sexual Isolation ◽  
Drosophila Simulans

SummarySexual isolation between the sibling species D. simulans and D. mauritiana is due largely to the rejection of D. simulans males by D. mauritiana females. Genetic analysis shows that genes on the X and third chromosomes contribute to the differences between males causing sexual isolation, while the Y chromosome, second chromosome and cytoplasm have no effect. These chromosome effects differ from those observed in a previous analysis of sexual isolation in hybrid females, implying that different genes cause sexual isolation in the two sexes.

SEXUAL ISOLATION BETWEEN TWO SIBLING SPECIES WITH OVERLAPPING RANGES: DROSOPHILA SANTOMEA AND DROSOPHILA YAKUBA

Evolution ◽  
2002 ◽  
Vol 56 (12) ◽  
pp. 2424 ◽  
Author(s):  
Jerry A. Coyne ◽  
Soo Y. Kim ◽  
Audrey S. Chang ◽  
Daniel Lachaise ◽  
Susannah Elwyn
Keyword(s):  
Sibling Species ◽  
Sexual Isolation ◽  
Drosophila Yakuba

THE SALIVARY GLAND CHROMOSOMES OF TWO SIBLING SPECIES OF BLACK FLIES INCLUDED IN EUSIMULIUM AUREUM FRIES

1958 ◽  
Vol 36 (1) ◽  
pp. 23-44 ◽  
Author(s):  
Robert W. Dunbar
Keyword(s):  
New York ◽  
Salivary Gland ◽  
Sibling Species ◽  
New York State ◽  
Chromosomal Polymorphism ◽  
Distinct Species ◽  
Black Flies ◽  
Southern Ontario ◽  
York State ◽  
Wide Range

Two closely related dichromosomic sibling species of Eusimulium "aureum" were segregated cytologically in populations sampled from the Toronto area. The known range of these two so far included southern Ontario and Quebec, and New York State. Both siblings have extremely similar salivary gland chromosomes but they differ by four homozygously rearranged regions, all in the first chromosome, and in the degree of chromosomal polymorphism. Although sympatric over a wide range, the two siblings do not interbreed as evidenced by the failure to find critical heterozygous loops for the interspecific inversions, and the absence of common intraspecific inversions. Therefore the siblings represent two biologically distinct species.

scholarly journals Evidence for Initiation of Post-Zygotic Reproductive Isolation between Drosophila ananassae and D. pallidosa as Indicated by Reduction in the Fertility of Hybrid Males

2020 ◽  
Vol 12 (2) ◽  
pp. 41
Author(s):  
Roshni Singh ◽  
Bashisth Narayan Singh
Keyword(s):  
Gene Flow ◽  
Reproductive Isolation ◽  
Sibling Species ◽  
Hybrid Sterility ◽  
Divergence Time ◽  
Sexual Isolation ◽  
Drosophila Ananassae ◽  
Species Pair ◽  
Hybrid Fertility ◽  
Species Pairs

There are several barriers to preclude the gene flow between diverging populations. On the basis of their temporal nature, these can be broadly categorized into two forms: pre- and post-zygotic. Post-zygotic reproductive isolation can manifest in the form of reductions in hybrid fertility. Keeping this fact in view, in the present study, we studied sterility in hybrids of D. ananassae and D. pallidosa. Surprisingly a distinguishable pattern of infertility was found in the hybrids. This pattern, referred to as Haldane’s rule, is often observed in hybrids of recently diverged populations or species. Reduction in the fertility of hybrids provides the clue of incipient kind of post-zygotic reproductive isolation in these two sibling species. This is the first report of hybrid sterility in this species pair. However, hybrid sterility is not very prominent especially when compared to that of other species pairs with the similar divergence time. Thus, on the basis of our results, we conclude that either sexual isolation between these sibling species is sufficient and does not require the aid of post-zygotic isolation to preclude gene flow or rate of divergence between D. ananassae and D. pallidosa is very slow in comparison to other species pair or even races of some species.

Divergent cytogenetic evolution in Nearctic and Palearctic populations of sibling species in Chironomus (Camptochironomus) Kieffer

1998 ◽  
Vol 76 (2) ◽  
pp. 361-376
Author(s):  
Iya I Kiknadze ◽  
Malcolm G Butler ◽  
Karlygash G Aimanova ◽  
Evgenya N Andreeva ◽  
Jon Martin ◽  
...  
Keyword(s):  
Sibling Species ◽  
Related Species ◽  
Polytene Chromosomes ◽  
Natural Populations ◽  
Chromosomal Polymorphism ◽  
The Other ◽  
Chironomus Tentans ◽  
Closely Related Species ◽  
Cytogenetic Evolution

Chromosomal polymorphism is described for natural populations of Chironomus pallidivittatus in both the Palearctic and Nearctic regions. The Palearctic populations studied exhibit 24 banding sequences, whereas 10 banding sequences have been recorded from Nearctic C. pallidivittatus. In total, 29 sequences and 37 genotypic combinations have been found. Of the 29 sequences known, only 5 are Holarctic (common to both the Nearctic and Palearctic), 19 are exclusively Palearctic, and 5 are Nearctic. The karyotype of Nearctic C. pallidivittatus is characterized by specific, homozygous Nearctic sequences in arms B and G and fixed Holarctic inversion sequences in the other arms. Only two chromosome arms in C. pallidivittatus, but all seven arms in the sibling species Chironomus tentans, differ between Palearctic and Nearctic forms by the presence of unique, homozygous sequences in the Nearctic karyotype. This indicates a great difference in the cytogenetic histories of these closely related species; much less karyotypic divergence between continents has occurred in C. pallidivittatus than in C. tentans. The cytogenetic distance between Palearctic and Nearctic populations of C. tentans is higher (DN = 1.62) than in C. pallidivittatus (DN = 0.27). Thus, Palearctic and Nearctic C. tentans should be regarded as sibling species, but Palearctic and NearcticC. pallidivittatus are best viewed as strongly divergent races of the same species. A photomap of polytene chromosomes of C. pallidivittatus is presented in which banding sequences are mapped by using C. tentans as a standard.

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