Darwin, nós temos um problema sério: eles continuam discutindo teleologia na biologia...
sexta-feira, setembro 13, 2024
Darwin, nós temos um sério problema: ainda não conseguimos reconstruir a natureza do LUCA
segunda-feira, setembro 09, 2024
Journal of Molecular Evolution
The Unfinished Reconstructed Nature of the Last Universal Common Ancestor
Review Open access
Published: 18 July 2024
Luis Delaye
Abstract
The ultimate consequence of Darwin’s theory of common descent implies that all life on earth descends ultimately from a common ancestor. Biochemistry and molecular biology now provide sufficient evidence of shared ancestry of all extant life forms. However, the nature of the Last Universal Common Ancestor (LUCA) has been a topic of much debate over the years. This review offers a historical perspective on different attempts to infer LUCA’s nature, exploring the debate surrounding its complexity. We further examine how different methodologies identify sets of ancient protein that exhibit only partial overlap. For example, different bioinformatic approaches have identified distinct protein subunits from the ATP synthetase identified as potentially inherited from LUCA. Additionally, we discuss how detailed molecular evolutionary analysis of reverse gyrase has modified previous inferences about an hyperthermophilic LUCA based mainly on automatic bioinformatic pipelines. We conclude by emphasizing the importance of developing a database dedicated to studying genes and proteins traceable back to LUCA and earlier stages of cellular evolution. Such a database would house the most ancient genes on earth.
FREE PDF GRATIS: Journal of Molecular Evolution
Darwin, nós temos sérios problemas: lacunas explanatórias na teoria da evolução
quinta-feira, setembro 05, 2024
Biology & Philosophy
Explanatory gaps in evolutionary theory
Open access
Published: 01 September 2024
Volume 39, article number 22, (2024)
Bendik Hellem Aaby, Gianmaria Dani & Grant Ramsey
Abstract
Proponents of the extended evolutionary synthesis have argued that there are explanatory gaps in evolutionary biology that cannot be bridged by standard evolutionary theory. In this paper, we consider what sort of explanatory gaps they are referring to. We outline three possibilities: data-based gaps, implementation-based gaps, and framework-based gaps. We then examine the purported evolutionary gaps and attempt to classify them using this taxonomy. From there we reconsider the significance of the gaps and what they imply for the proposed need for an extended evolutionary synthesis.
FREE PDF GRATIS: Biology & Philosophy
Qual fato, Fato, FATO da evolução foi considerado neste livro? Microevolução ou macroevolução?
domingo, setembro 01, 2024