Did the ctenophore nervous system evolve independently?

Recent evidence supports the placement of ctenophores as the most distant relative to all other animals. This revised animal tree means that either th...
352KB Sizes 5 Downloads 12 Views

Recommend Documents

Why, when, and how did yeast evolve alcoholic fermentation?
The origin of modern fruits brought to microbial communities an abundant source of rich food based on simple sugars. Yeasts, especially Saccharomyces cerevisiae, usually become the predominant group in these niches. One of the most prominent and uniq

Did the notochord evolve from an ancient axial muscle? The axochord hypothesis.
The origin of the notochord is one of the key remaining mysteries of our evolutionary ancestry. Here, we present a multi-level comparison of the chordate notochord to the axochord, a paired axial muscle spanning the ventral midline of annelid worms a

Ctenophore trees.
Comb jellies are remarkably different from other animals. Phylogenetic analyses of broadly sampled ctenophore transcriptome data provide additional evidence that they are the sister group to all other animals and reveal details of their evolutionary

Combined surgical-orthodontic treatment: how did it evolve and what are the best practices now?
It has been 50 years since the landmark presentation by Hugo Obwegeser at Walter Reed Army Hospital. At that conference, Professor Obwegeser offered American surgeons techniques to correct facial skeletal deformities with access through intraoral inc

Did meiosis evolve before sex and the evolution of eukaryotic life cycles?
Biologists have long theorized about the evolution of life cycles, meiosis, and sexual reproduction. We revisit these topics and propose that the fundamental difference between life cycles is where and when multicellularity is expressed. We develop a

Elaborate visual and acoustic signals evolve independently in a large, phenotypically diverse radiation of songbirds.
The concept of a macroevolutionary trade-off among sexual signals has a storied history in evolutionary biology. Theory predicts that if multiple sexual signals are costly for males to produce or maintain and females prefer a single, sexually selecte

Q&A: What is human language, when did it evolve and why should we care?
Human language is unique among all forms of animal communication. It is unlikely that any other species, including our close genetic cousins the Neanderthals, ever had language, and so-called sign 'language' in Great Apes is nothing like human langua

Systematic study on G-protein couple receptor prototypes: did they really evolve from prokaryotic genes?
G-protein couple receptor (GPCR) is one of the most striking examples of signalling proteins and it is only observed in eukaryotes. Based on various GPCR identification methods and classification systems, several evolutionary presumptions of differen

Did Viruses Evolve As a Distinct Supergroup from Common Ancestors of Cells?
The evolutionary origins of viruses according to marker gene phylogenies, as well as their relationships to the ancestors of host cells remains unclear. In a recent article Nasir and Caetano-Anollés reported that their genome-scale phylogenetic analy