CSHL scientists are part of consortium that sequences platypus genome
...distinct mode of rearing its offspring. All of the mammals, in addition to being warm-blooded, can be grouped according to their modes of gestation. marsupials
like the kangaroo rear profoundly immature young in external pouches for extended periods of time. Eutherian mammals like mice and humans protect thei...
Early bird doesn't always get worm, UNC researcher finds
...ed resources provided by their parents. Such competitive disparities caused by hatching or birth order can be found in other animals from beetles to marsupials
to humans which sometimes produce their young in series, then rear the resulting offspring simultaneously.
But Sockman says up until now, such ob...
Treatment of Premature Babies, Opossums Could Help
It could also lead to breakthroughs in the understanding and treatment of facial tumours afflicting the Tasmanian Devils, carnivorous marsupials
now found only in the Australian island state of Tasmania.
A US research team compiled the full set of genetic information of the South American...
Marsupials in Biological News
The evolutionary foundation of genomic imprinting in lower vertebrates
...mals. The study is reported in volume 54 (Issue 8, April, 2009) of Chinese Science Bulletin .
Genomic imprinting has been identified in eutherians, marsupials
and flowering plants, but no endogenous imprinted gene has been reported in other vertebrates and invertebrates. Therefore, genomic imprinting is thou...
Unheard of life history for a vertebrate
...les and humans that can live for a century) and at the lower end by a handful of animals that only live for about a year. The males in nine species of marsupials
die off after a year, for example, as do most adults in about twelve species of lizards. But the chameleon described here, Furcifer labordi , not onl...
Marsupial lion tops African lion in fight to death
... major trauma and a rapid kill. Unlike any living mammalian carnivores, the marsupials
carnassials were not only butchery tools but also active components in the ...ent (FE) analysis], that renders dynamic 3D models based on CT scans of the marsupials
cranial mechanics and musculoskeletal architecture, Wroe has revealed that ...
Researchers publish first marsupial genome sequence
...alysis program and the study's senior author.
and the ancestors of placental mammals diverged 18...are present in placental mammals, but missing from marsupials
—that is, the genetic factors that may underlie ma... involved in immunity, challenging the notion that marsupials
possess only primitive immune systems.
Tiny bones rewrite textbooks
...25 to 30 million years ago."
The team believes that more mammal specimens may emerge, perhaps even species that pre-date the split between pouched marsupials
and live-bearing placental mammals.
The St Bathans fossil field - which has also produced many other species of animals, including fish and birds ...
Where 'jumping genes' fear to tread
...many TFRs are evolutionarily conserved features that existed prior to ?and have been largely maintained since ?the divergence of eutherian mammals and marsupials
approximately 170 million years ago."
The opossum was chosen for inclusion in the analysis because it is a marsupial that has a similar load of tra...
Behavioral studies show UV contributes to marsupial color vision
...plication of the MWS/LWS gene, which enables the discrimination of green-red colors. But the researchers' previous physiological studies in Australian marsupials
provided original evidence for the potential of trichromatic color vision in mammals other than primates. The findings were consistent in several dist...
Marsupial genome reveals insights into mammalian evolution
... The genetic code of marsupials
has now been documented for the first time. An in...ther mammals 210 million years ago. The remaining marsupials
split from the main (placental) group about 180 ye...tral mammals. "Understanding the immune system of marsupials
and monotremes will help us to conserve our native...
Small species back-up giant marsupial climate change extinction claim
... change, instead of humans, was responsible for wiping out Australian giant marsupials
or megafauna 40,000 years ago.
Instead of only excavating 'trophy specim...hile in Australia - which evolved for 40 million years in isolation - giant marsupials
Current theories suggest that between 50,000 and 20,000 years ago...
Marsupials in Biological Definition
... inactive X chromosome in a female cell, or the inactive Z in a male. This happens early in embryonic development at random in mammals , except in marsupials
and in some extra-embryonic tissues of some placental mammals, in which the father's X chromosome is always deactivated.
The inactivation state of ...
...considered inert. This formation of Barr bodies is called Lyonization .
In humans the X chromosome that is inactivated is determined by chance. In marsupials
, however, the paternal X chromosome is always inactivated. Inactivation is achieved by methylation of the X chromosome DNA, a common way in which t...
Marsupials in Biological Dictionary
are an infraclass of mammals, characterized by a distinctive pouch, in which females carry their young through early infancy. Marsupials
are the group of mammals commonly thought of as pouched mammals. ... In the past, however, marsupials
were quite common. ... Information ...
...mammals that are more closely related to living placentals than to living marsupials
. They are distinguished from non-eutherians by various... Placental ...etaceous--Tertiary boundary and far older than paleontological data. ... marsupials
in Australia and placental mammals in North America provide another ......
...heria) instead of giving birth to live young like marsupials
(Metatheria) and placental mammals (Eutheria). ...s. Information for students K-6 about mammals, marsupials
and monotremes ... Mammals, marsupials
and Monotremes . Mammals are animals that have ...
...er membranes, the amnion and chorion, to serve as a temporary respiratory organ while its cavity stores fetal excretions. In mammals other than marsupials
the allantois is intimately associated with... The allantois will become the umbilical cord whilst the chorion, ... As the allantois grows...