love this... you don't have to have the latest clothing to look fab ❤️
Gemma Chan
❤️ Emma looks stunning in Alexander McQueen
Amber Heard
Author Summary Advances in human biomedicine, including those focused on changes in genes triggered or disrupted in development, resistance/susceptibility to infectious disease, cancers, mechanisms of recombination, and genome plasticity, cannot be adequately interpreted in the absence of a precise evolutionary context or hierarchy. However, little is known about the genomes of other primate species, a situation exacerbated by a paucity of nuclear molecular sequence data necessary to resolve the complexities of primate divergence over time. We overcome this deficiency by sequencing 54 nuclear gene regions from DNA samples representing ∼90% of the diversity present in living primates. We conduct a phylogenetic analysis to determine the origin, evolution, patterns of speciation, and unique features in genome divergence among primate lineages. The resultant phylogenetic tree is remarkably robust and unambiguously resolves many long-standing issues in primate taxonomy. Our data provide a strong foundation for illuminating those genomic differences that are uniquely human and provide new insights on the breadth and richness of gene evolution across all primate lineages.
Эволюция протомлекопитающих от зверообразных рептилий до первозверей
GEOL 104 Theropoda I: Dinosaurs Red in Tooth and Claw
This week, a new study of the penguin evolutionary tree officially appeared in Systematic Biology (though the proof has been available online ahead of formal publication). This represents the first paper from an exciting new project aiming to develop Bayesian methods for combining data from fossils and living species. I'll be teaming with the exceptional…
Cartoons at Random by The New Yorker
Milksnake phylogeography
The archosaurs (“ruling reptiles”, Cope 1869) are a speciose and diverse group that includes birds, dinosaurs, and crocodylomorphs, as well as a range of extinct taxa restricted to the Mesozoic (Fi...
Chordates are a phylum in the animal kingdom that include the vertebrates and the few closely related invertebrates that have, at least for a short period of their life, a notochord, a hollow nerve chord, pharyngeal slits, an endostyle and a post-anal tail. Characteristics that define the group Notochord The notochord is flexible and rod-shapped. It’s found in all chordates, although for some it’s only found in the embryos. The notochord is found ventrally (towards the top) of the neural tube. Dorsal Neural Tube / Hollow Nerve Chord A neural tube is found in all chordates. In vertebrates this becomes the spinal cord and brain. Pharyngeal Slits and Pharyngeal Arches Phyngeal slits are filter-feeding organs found in the non-vetebrate chordates. Vertebrates have pharyngeal slits as embryos. Humans for instance have gill-like slits in the neck as embryos. Endostyle The endostyle is a longitudinal ciliated groove on the ventral surface of the pharynx that produces mucus to gather food particles. Like the phyarngeal slits, the endostyle has taken different forms in the different taxa. It is found in the urochordates and cephalochordates, and even larval lampreys. In vertebrates it is considered homologous to the thyroid gland (although this is debated). Post-anal Tail Basically, chordates have a muscular tail that extends back, past the anus. In humans, for instance, we have a tailbone and have lost the tail. Yet, this is still considered characteristic of all chordates. Classification The following living classes exist in the phylum Chordata (referencing www.catalogueoflife.org 2011): Class Actinopterygii (Ray-finned Fishes) Class Amphibia (Amphibians) Class Appendicularia (Larvacea) Class Ascidiacea (Ascidians) Class Aves (Birds) Class Cephalaspidomorphi (Lanceletes) Class Chondrichthyes (Sharks, Skates, and Rays – Chimeras) Class Mammalia (Mammals) Class Myxini (Hagfish) Class Reptilia (Reptiles) Class Sarcopterygii (Lobe-finned Fishes) Class Thaliacea – (Thaliaceans)
An overview of the molluscs, with coverage of recent and extinct groups.
An overview of the molluscs, with coverage of recent and extinct groups.
An overview of the molluscs, with coverage of recent and extinct groups.
N pervillei
