Chromosome evolution of Drosophila albomicans
Date Issued
2008
Date
2008
Author(s)
Tsai, Tai-hua
Abstract
Comparing karyotypes differences on a phylogenetic tree shows three chromosome fusion events and one pericentric inversion in the Drosophila immigrans species group. A young species, D. albomicans, included all those changes in its karyotype is the only one with neo-X and neo-Y chromosomes formed by autosome and X, Y chromosome fusions. The chromosome homology between D. albomicans and D. melanogaster may provide valuable information to study the evolutionary changes on the 3rd chromosome arm of D. albomicans neo-sex chromosomes. Chromosome arm homology was revealed by DNA sequence similarity of genes between these two species. Since no D. albomicans database available, we established several PCR-RFLP genetic markers for checking sex-linkage by D. albomicans and D. nusata hybrid crosses and established the hypothesis of chromosome arm relationship. The hypothesis was supported by sexual differences of those loci within certain isofemale strains, and then confirmed by in situ hybridization. Based on chromosome homology the process of chromosome evolution of D. immigans species group was discussed.
Subjects
Drosophila immigrans species gruop
Karyotype
Type
thesis
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