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First Sex Determining Genes Appeared In Mammals Some 180 Million Years Ago
2014-04-24 03:55:04

Swiss Institute of Bioinformatics This news release is available in French and German. Man or woman? Male or female? In humans and other mammals, the difference between sexes depends on one single element of the genome: the Y chromosome. It is present only in males, where the two sexual chromosomes are X and Y, whereas women have two X chromosomes. Thus, the Y is ultimately responsible for all the morphological and physiological differences between males and females. But this has not...

science-082511-001
2011-08-25 11:05:58

  A well-preserved fossil discovered in China provides new evidence that the split between placental mammals and marsupials may have occurred 35 million years earlier than previously believed, according to a new study published Wednesday in the journal Nature. The scientists, led by Carnegie Museum of Natural History paleontologist Zhe-Xi Luo, said the discovery fills an important gap in the fossil record, and helps to calibrate modern, DNA-based methods of dating evolution. The...

7720955e55f994dacc20cc75ddeeb1c21
2011-04-14 09:12:02

Fossil from China suggests mammalian ear of monotremes evolved separately from that of marsupials and placentals Paleontologists from the American Museum of Natural History and the Chinese Academy of Sciences announce the discovery of Liaoconodon hui, a complete fossil mammal from the Mesozoic found in China that includes the long-sought transitional middle ear. The specimen shows the bones associated with hearing in mammals"” the malleus, incus, and ectotympanic"” decoupled from...


Word of the Day
Cthulhu
  • A gigantic fictional humanoid alien god being described with a head resembling an octopus and dragon wings and claws, around whom an insane cult developed.
  • Pertaining to the mythos of Cthulhu and additional otherworldly beings created by H. P. Lovecraft or inspired by his writings and imitators.
This word was invented in 1926 by H.P. Lovecraft for his short story, 'The Call of Cthulhu.' 'Cthulhu' may be based on the word 'chthonic,' which in Greek mythology refers to the underworld.
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