Fruitfly genome in not junk
Article Abstract:
A comparison of two fruitfly genomes has shown that much of their non-coding DNA is controlled by either negative or positive selection, which is a double blow to the neutral theory of molecular evolution. The relatively junk-free regions between genes in Drosophila are the likely targets of positive selection and hence it is fair to assume that the accumulation of beneficial mutations had a major role in the evolution of functional segments in the intergenic regions in mammal-like genomes.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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Interactions among quantitative traits in the course of sympatric speciation
Article Abstract:
Sympatric speciation has been involved in formation of several species flocks and may be quite common in nature. Disruptive selection favouring two very different phenotypes is the most straightforward scenario for sympatric speciation. The hypergeometric phenotypic model is used to demonstrated that sympatric speciation is feasible even if fitness and mate choice relies on different quantitative traits.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Positive selection at sites of multiple amino acid replacements since rat-mouse divergence
Article Abstract:
The divergence of rat-mouse at codons involving non-synonymous substitutions occurred at the same lineage. The clumping of multiple non-synonymous substitutions in the same lineage was examined by the comparison of 12 pairs of prokaryotic genomes, and this indicates that positive selection acts at many sites of rapid, successive amino acid replacement.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
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