a new p element subfamily from drosophila tristis, d. ambigua, and d. obscura. | a new p element subfamily, designated t-type, was found in the genomes of the three closely related species drosophila ambigua, drosophila obscura, and drosophila tristis. the subfamily comprises both full-sized and internally deleted p elements. the t-type element of d. ambigua is longer than the canonical p elements owing to a 300-bp insertion in the 3' noncoding region. tandemly arranged t-type elements were detected in d. ambigua and d. tristis. the overall structure of t-type elements resem ... | 1996 | 8890523 |
mitochondrial dna evolution in the obscura species subgroup of drosophila. | mitochondrial dna (mtdna) restriction site maps for nine species of the drosophila obscura subgroup and for drosophila melanogaster were established. taking into account all restriction enzymes (12) and strains (45) analyzed, a total of 105 different sites were detected, which corresponds to a sample of 3.49% of the mtdna genome. based on nucleotide divergences, two phylogenetic trees were constructed assuming either constant or variable rates of evolution. both methods led to the same relations ... | 1990 | 2120450 |
evolution of a telomere associated satellite dna sequence in the genome of drosophila tristis and related species. | a highly repetitive satellite dna sequence from the genome of drosophila tristis with a length of 181 bp has been cloned in the puc plasmid. the sequence hybridizes to the telomeres of all chromosomes but the y of d. tristis and produces a ladderlike hybridization pattern with filterbound genomic dna of d. tristis digested with eco ri or pst i with the hybridization bands at fragment lengths in multiples of 181 bp. a similar pattern is found when the genomic dna comes from d. ambigua or, though ... | 1990 | 2090564 |