Evolution of a recent neo-Y sex chromosome in a laboratory population ofDrosophila

Tanuja, M. T.; Ramachandra, Nallur B.; Ranganath, H. A.

doi:10.1007/bf02924559

Cited by 5 publications

(2 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…opportunity to analyze, at the molecular level, the evolutionary process of Y chromosome degeneration (Steinemann and Steinemann 1998). Likewise, the experimental approach in the Drosophila nasuta nasuta-albomicans complex, in which a novel chromosomal race produced by laboratory hybridization, allowed the study of the process of transition of an autosome to a Y sex chromosome from the moment of its commitment to the male genome (Tanuja et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Neo-sex chromosome diversity in Neotropical melanopline grasshoppers (Melanoplinae, Acrididae)

2010

View full text Add to dashboard Cite

We report the results of a study on the neo-sex chromosome systems of six Neotropical Melanoplinae species for contributing to a better understanding of their origin and behaviour of these systems. Our analyses included detailed descriptions of the structure and behaviour of the sex chromosome configurations in male and female meiosis of species belonging to the genera Ronderosia, Dichromatos and Atrachelacris. Three species, R. forcipatus, R. malloi and A. unicolor, showed typical Robertsonian fusion-derived neo sex-chromosomes. However, the male metaphase I orientation of R. bergi sex pair indicated that more than one rearrangement was involved in its origin. The two species of Dichromatos presented a multiple neo-X(1)X(2)Y/X(1)X(1)X(2)X(2) sex system, with two Robertsonian fusions involved in their genesis. Observations of female meiosis, confirmed the nature of the sex-chromosomes analyzed. Our results also showed different degrees of homology divergence between the neo-sex chromosomes and emphasize the plasticity of the chromosome complement of the Neotropical Melanoplinae to establish Robertsonian fusions and generate novel sex-chromosome systems. We also discuss karyotypic diversity within this group in terms of the centromeric drive theory of chromosomal evolution.

show abstract

Section: Introductionmentioning

confidence: 99%

Neo-sex chromosome diversity in Neotropical melanopline grasshoppers (Melanoplinae, Acrididae)

2010

View full text Add to dashboard Cite

show abstract

“…Therefore, in this cytorace, two chromosomes are limited to the male genome-the regular Y chromosome, and the acrocentric autosome 3 inherited from the D. nasuta parent (figure 5). As this autosome 3 is cosegregating with the Y chromosome and is limited to males, it is called a recent neo-Y chromosome (Tanuja et. al.…”

Section: Isozymesmentioning

confidence: 99%

Hybridization, transgressive segregation and evolution of new genetic systems inDrosophila

Ranganath

Aruna

2003

J Genet

View full text Add to dashboard Cite

Introgressive hybridization facilitates incorporation of genes from one species into the gene pool of another. Studies on long-term effects of introgressive hybridization in animal systems are sparse. Drosophila nasuta (2n = 8) and D. albomicans (2n = 6)-a pair of allopatric, morphologically almost identical, cross-fertile members of the nasuta subgroup of the immigrans species group-constitute an excellent system to analyse the impact of hybridization followed by transgressive segregation of parental characters in the hybrid progeny. Hybrid populations of D. nasuta and D. albomicans maintained for over 500 generations in the laboratory constitute new recombinant hybrid genomes, here termed cytoraces. The impact of hybridization, followed by introgression and transgressive segregation, on chromosomal constitution and karyotypes, some fitness parameters, isozymes, components of mating behaviour and mating preference reveals a complex pattern of interracial divergence among parental species and cytoraces. This assemblage of characters in different combinations in a laboratory hybrid zone allows us to study the emergence of new genetic systems. Here, we summarize results from our ongoing studies comparing these hybrid cytoraces with the parental species, and discuss the implications of these findings for our understanding of the evolution of new genetic systems.

show abstract

Incipient sexual isolation in thenasuta-albomicans complex ofDrosophila: mating preference in male-, female- and multiple-choice mating experiments

2001

View full text Add to dashboard Cite

Interracial divergence is an important facet of speciation. The nasuta-albomicans complex of Drosophila with sixteen morphologically identical, karyotypically different but cross-fertile races is an excellent system to study a few dimensions of raciation. Drosophila nasuta nasuta, Drosophila nasuta albomicans, Cytorace 1, Cytorace 2, Cytorace 3 and Cytorace 4 of this subgroup have been subjected to male-, female- and multiple-choice mating experiments. Out of 8456 crosses conducted, 7185 had successful matings. The overall impression is that mating is far from random amongst these six closely related races of the nasuta-albomicans complex. The males of D. n. albomicans, Cytorace 1 and Cytorace 4 in male-choice, the females of Cytorace 1 and Cytorace 2 in female-choice, and the males and females of D. n. nasuta, D. n. albomicans, Cytorace 1 and Cytorace 4 against the males and females of Cytorace 2 in multiple-choice experiments, had significantly more homogamic matings than expected. Thus in this study of evolutionary experimentation on raciation under laboratory conditions, we have documented the initiation of preference for conspecific matings among closely related and independently evolving members of the nasuta-albomicans complex of Drosophila.

show abstract

Evolution of a recent neo-Y sex chromosome in a laboratory population ofDrosophila

Cited by 5 publications

References 18 publications

Neo-sex chromosome diversity in Neotropical melanopline grasshoppers (Melanoplinae, Acrididae)

Neo-sex chromosome diversity in Neotropical melanopline grasshoppers (Melanoplinae, Acrididae)

Hybridization, transgressive segregation and evolution of new genetic systems inDrosophila

Incipient sexual isolation in thenasuta-albomicans complex ofDrosophila: mating preference in male-, female- and multiple-choice mating experiments

Contact Info

Product

Resources

About