Evolution illustration. Through the new method, scientists have a detailed understanding of when mammals appeared and evolved to this day.
Nationalgeographic.co.id—Speed thing evolution, its timeline and species types have long been noted by scientists. The problem is, there’s always a new discovery that fills in the gaps in the timeline that keeps it tangled up again, and scientists have to sort it out.
Therefore, the paper published December 22 in the journal Nature, offers the most detailed timeline of the evolution of the most ancient mammals to date. The researchers created the ‘time tree’ with an explanation of the approach of a new computational method, and was quick to get the exact evolutionary tree by date.
This is a relatively new method for analyzing mammalian genome data sets and helps scientists answer longstanding questions such as when did modern placental mammals originate, whether it was during the mass extinction of the dinosaurs or not.
“By integrating the full genome in the analysis and the necessary fossil information, we can reduce uncertainty and get a precise evolutionary timeline,” said Sandra Alvarez-Carretero, lead author of the paper from the School of Biological and Behavioral Sciences, Queen Mary University of London. became University College London.
“Did modern mammalian groups coexist with dinosaurs, or did they originate after a mass extinction? We now have a definite answer,” he said in release.
The developments carried out by these researchers used statistics New Bayesian, which is fast rated for analyzing a large number of genomic sequences. It also takes into account the uncertainty in the data.
“We broke the computational hurdle by dividing the analysis into sub-levels: first simulating a timeline using 72 genomes and then using the results to create simulations in the remaining species,” said Mario dos Reis, research associate and doctorate in the School of Biological and Behavioral Sciences, Queen Mary University of London.
“Using a genome can reduce uncertainty because it allows the rejection of unreasonable time sequences from simulations,” he continued.
They confirmed the group ancestor mammal modern placenta, emerged after the great extinction that occurred 66 million years ago. Mammals placenta is a scientific group to define mammal the most diverse of life, such as primates, rodents, cecateca (such as dolphins and orcas), chiropterans (bats), and humans.