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Tempo and mode in evolution.
In the introduction to his book, Simpson averred that an essential part of his study was an "attempted synthesis of paleontology and genetics," an effort that pervaded the whole book, but was particularly the subject of the first two chapters, which accounted for nearly half the book's pages.
Nucleotide sequences provide evidence of genetic exchange among distantly related lineages of Trypanosoma cruzi
Well-supported gene genealogies show that mitochondrial and nuclear gene sequences from T. cruzi cluster, respectively, in three or four distinct clades that do not fully correspond to the two previously defined major lineages of T.cruzi.
Microbes on Mountainsides: Contrasting Elevational Patterns of Bacterial and Plant Diversity
Evidence for positive selection in the superoxide dismutase (Sod) region of Drosophila melanogaster.
The large group of nearly identical haplotypes suggests that a recent mutation, at the Sod locus or tightly linked to it, has increased rapidly in frequency to around 50%, both in California and Spain.
GENETIC DIFFERENTIATION DURING THE SPECIATION PROCESS IN DROSOPHILA
- F. Ayala, M. Tracey, D. Hedgecock, R. Richmond
- BiologyEvolution; international journal of organic…
- 1 December 1974
The question, "how much genetic differentiation occurs in the process of speciation," must be unfolded into two separate questions concerning the two stages of the process, and the genetic differentiation occurring between allopatric populations that are likely to give rise to different species if and when they become, at least partially, sympatric.
Global models of growth and competition.
This model represents an extension of the Lotka-Volterra model of competition; it adds a fourth parameter that controls the degree of nonlinearity in intraspecific growth regulation and represents a similar Extension of the logistic model of population growth.
Resistance, Resilience, and Redundancy in Microbial Communities
Adaptations of Trypanosoma brucei to gradual loss of kinetoplast DNA: Trypanosoma equiperdum and Trypanosoma evansi are petite mutants of T. brucei
- D. Lai, H. Hashimi, Z. Lun, F. Ayala, J. Lukeš
- BiologyProceedings of the National Academy of Sciences
- 12 February 2008
It is shown that both species are actually strains of T. brucei equiperdum and T. evansi, which lost part (Dk) or all (Ak) of their kDNA, and these trypanosomes are not monophyletic clades and do not qualify for species status.