Here, we studied rodent sperm centrioles and found that centriole degeneration in rodents occurred only after the evolution of centriole-independent embryonic development in the ancestor of families Cricetidae and Muridae and was correlated with an evolutionarily novel, lateral, head-neck attachment in...
Life is a chemical reaction. Three major transitions in early evolution are considered without recourse to a tree of life. The origin of prokaryotes required a steady supply of energy and electrons, probably in the form of molecular hydrogen stemming fro
When Jane Goodall gives public talks, she often begins by giving a pant-hoot: a loud call that begins with soft hoos, followed by grunts, barks or screams, and often ends with grunts again. (Jane usually leaves out the screams, though, as she thinks those sound too aggressive.) Spectro...
Aeadsx produces sex-specific transcripts by alternative splicing, which encode isoforms with a high degree of identity to Anopheles gambiae and Drosophila melanogaster homologues. Interestingly, Aeadsx produces an additional novel female-specific splicing variant. Genomic comparative analyses between the ...
(without TP, simpler acorn) pinpoint the eukaryote tree's root between them and TP-bearers, highlighting novel superclades. I integrate TZ/ciliary evolution with the best multiprotein trees, naming newly recognised major eukaryote clades and revise megaclassification of basal kingdom Protozoa. ...
its genes are shuffled and recombined in novel ways. There are both common and rare genotypes in a sexual population. The parasite population will evolve to be able to attack the most common genotype, as they do with the clones, but in this case, it will be a far smaller portion of the...
"All of us are part of an old, old family," begins Peters's (Cold Little Duck, Duck, Duck) lyrical, child-friendly book about evolution. Stressing the kinship of humans with all living things, the text identifies each of the species at various stages of evolution not just as "our" re...
It turns out that FGF-ERK signaling is crucial. FGF signaling is required for neural induction, which begins during early gastrulation. The anterior neural ridge (ANR) is located in the anterior neural plate of vertebrates and expresses FGFs (FGF8/17/18), which are important for patterning the...
The Yakuts contrast strikingly with other populations from Siberia due to their cattle- and horse-breeding economy as well as their Turkic language. On the basis of ethnological and linguistic criteria as well as population genetic studies, it has been a
Labichea stellata, one of the intermediate forms, with tough, leathery, narrow leaves adapted to a hot, dry climate. Studying the morphology – the physical form – of a plant will tell you a lot about the challenges of the place it evolved and what it had to survive to make it to ...