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Qu'est-ce (qui) est mammalian$46568$ - définition

REPRODUCTIVE STRATEGY
Mammalian Embryonic Diapause; Delayed implantation; Mammalian embryonic diapause
  • Mechanism of facultative embryonic diapause

Borna disease virus         
SPECIES OF VIRUS
BDV; Mammalian 1 bornavirus; Mammalian 1 orthobornavirus
The Borna disease viruses 1 and 2 (BoDV-1 and BoDV-2) are members of the species Mammalian 1 orthobornavirus and cause Borna disease in mammals.
Mammalian-wide interspersed repeat         
Mammalian wide interspersed repeat
Mammalian-wide interspersed repeats (MIRs) are transposable elements in the genomes of some organisms and belong to the group of Short interspersed nuclear elements (SINEs).
Evolution of mammals         
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  • Cloverly formation environment with ''[[Gobiconodon]]'' pursuing juvenile ''[[Aquilops]]'' while adults attempt to protect them.
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  • Reconstruction of ''[[Castorocauda]]''. Note the fur and the adaptations for swimming (broad, flat tail; webbed feet) and for digging (robust limbs and claws).
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  • Fossil of ''[[Eomaia]]'' in the [[Hong Kong Science Museum]].
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  • quadrate]] (rear).
  • quadrate]] and [[articular]] bones are small and part of the [[middle ear]]; the [[lower jaw]] consists only of [[dentary]] bone.
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  • ''[[Lystrosaurus]]'', one of the few genera of dicynodonts that survived the [[Permian–Triassic extinction event]]
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  • Restoration of ''[[Procynosuchus]]'', a member of the [[cynodont]] group, which includes the ancestors of [[mammals]]
  • Skull of the multituberculate ''[[Ptilodus]]''
  • Artist's impression of the Purbeck lagoon at dusk : ''[[Durlstotherium]]'' (right and center foreground) and ''[[Durlstodon]]'' (left foreground) ventured out at night to hunt insects.
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  • hole behind each eye]], in a fairly low position on the skull (lower right in this image).
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  •  Skull of [[thylacine]], showing [[marsupial]] pattern of molars
  • Artist's conception of the cynodont ''[[Trirachodon]]'' within a burrow
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  • Restoration of ''[[Volaticotherium]]'', a Middle Jurassic [[eutriconodont]] and the earliest known [[gliding]] mammal.
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EVOLUTION LEADING TO TODAY'S MAMMALS
Mammalian evolution; Mammal evolution; Mammalian Evolution; Evolution of Mammals; Mammal expansion; First mammals; Evolution of placental mammals; Evolution of the mammalian middle ear and jaw; Evolution of the digestive system in mammals
The evolution of mammals has passed through many stages since the first appearance of their synapsid ancestors in the Pennsylvanian sub-period of the late Carboniferous period. By the mid-Triassic, there were many synapsid species that looked like mammals.

Wikipédia

Embryonic diapause

Embryonic diapause (a.k.a. delayed implantation in mammals) is a reproductive strategy used by a number of animal species across different biological classes, including mammals. In most species, the process occurs at the blastocyst stage of embryonic development and is characterized by a dramatic reduction or complete cessation of mitotic activity, arresting most often in the G0 or G1 phase of division.

In placental embryonic diapause, the blastocyst does not immediately implant in the uterus after sexual reproduction has resulted in the zygote, but rather remains in this non-dividing state of dormancy until conditions allow for attachment to the uterine wall to proceed as normal. As a result, the normal gestation period is extended for a species-specific time.

Diapause provides a survival advantage to offspring, because birth or emergence of young can be timed to coincide with the most hospitable conditions, regardless of when mating occurs or length of gestation; any such gain in survival rates of progeny confers an evolutionary advantage.