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Full-Text Articles in Life Sciences
Long-Term Experimental Hybridisation Results In The Evolution Of A New Sex Chromosome In Swordtail Fish, Paolo Franchini, Julia C. Jones, Peiwen Xiong, Susanne Kneitz, Zachariah Gompert, Wesley C. Warren, Ronald B. Walter, Axel Meyer, Manfred Schartl
Long-Term Experimental Hybridisation Results In The Evolution Of A New Sex Chromosome In Swordtail Fish, Paolo Franchini, Julia C. Jones, Peiwen Xiong, Susanne Kneitz, Zachariah Gompert, Wesley C. Warren, Ronald B. Walter, Axel Meyer, Manfred Schartl
Biology Faculty Publications
The remarkable diversity of sex determination mechanisms known in fish may be fuelled by exceptionally high rates of sex chromosome turnovers or transitions. However, the evolutionary causes and genomic mechanisms underlying this variation and instability are yet to be understood. Here we report on an over 30-year evolutionary experiment in which we tested the genomic consequences of hybridisation and selection between two Xiphophorus fish species with different sex chromosome systems. We find that introgression and imposing selection for pigmentation phenotypes results in the retention of an unexpectedly large maternally derived genomic region. During the hybridisation process, the sex-determining region of …
A Biogeographic Perspective On The Evolution Of Fire Syndromes In Pine Trees (Pinus: Pinaceae), Kevin J. Badik, Joshua P. Jahner, Joseph S. Wilson
A Biogeographic Perspective On The Evolution Of Fire Syndromes In Pine Trees (Pinus: Pinaceae), Kevin J. Badik, Joshua P. Jahner, Joseph S. Wilson
Biology Faculty Publications
Our goals were to explore the relationship between biogeography and the evolution of fire-adaptive syndromes in the genus Pinus. We used a previously published time-calibrated phylogeny and conducted ancestral trait reconstruction to estimate the likely timing of diversification in Pinus, and to determine when fire-adaptive syndromes evolved in the lineage. To explore trait conservation among fire syndromes and to investigate historical biogeography, we constructed ancestral state reconstructions using the program RASP and estimated the degree of conservatism for fire-adapted traits in the program BaTS. Our reconstructions suggest that the Bering land bridge, which connected North America and Asia, probably played …