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Example sentences for: mauritiana
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The expected number of polymorphisms between D. melanogaster and D. mauritiana was calculated based on the Drosophila neutral substitution rate of .016 (± 0.005) substitutions per site/million years [ 18 ] on 685 bp over a divergence time of 2.7 million years [ 19 ] .
The sequence of this region in a D. melanogaster (Dimonika, Africa) and D. mauritiana (Mauritius, Africa) strain was aligned with the homologous region in the sequenced D. melanogaster y; cn bw sp strain (Figure 3).
Thus, to further test the adaptive hypothesis we compared the level of sequence divergence within the LTR and its flanking intronic sequence between the two sibling species Drosophila melanogaster and Drosophila mauritiana . If the LTR-containing intron is under stabilizing selection, a lower than neutral rate of substitution would be expected.
Adh is a widely studied Drosophila gene and it has been sequenced in several Drosophila species including D. melanogaster , accession X60793 [ 20 ] and D. mauritiana , accession M19264 [ 21 ] . The sequence divergence between D. melanogaster and D. mauritiana in the Adh intron 1 (7.
The melanogaster sequences were found to be only 1.3% (9 substitutions/685 nucleotide sites) diverged from that of D. mauritiana . This value is significantly less than half of the expected 4.3 % (± 2.7) divergence based on the Drosophila neutral substitution rate of 0.016 (± 0.005) substitutions/site/million year [ 18 ] over the estimated 2.7 million years separating the two species [ 19 ] .
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