tag:blogger.com,1999:blog-6821840758756075048.post6762439903780809203..comments2023-09-25T09:44:38.184-07:00Comments on Evolutionary Novelties: Evolutionary Novelty: Mammalian PlacentaUnknownnoreply@blogger.comBlogger2125tag:blogger.com,1999:blog-6821840758756075048.post-10109486523573061962010-08-30T11:15:05.462-07:002010-08-30T11:15:05.462-07:00Have you considered the theories that placenta evo...Have you considered the theories that placenta evolution is thought to be directly tied to retrovirus DNA inserts? This is thought to be the case in sheep. When the retrovirus gene was silenced, the embryo couldn't attach to the placenta and it was miscarried.<br />This is astounding (and to me unbelievable) that placenta development in some animals resulted from a virus. I would wonder how successful reproduction was in the early mammals before this viral insert - and why other animals who don't have the viral insert are able to cope without it?Aaronhttp://blazingwear.com/noreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-74201732534557296662009-03-06T22:25:00.000-08:002009-03-06T22:25:00.000-08:00"Visceral"...ha ha!"Visceral"...ha ha!NickMhttps://www.blogger.com/profile/04765417807335152285noreply@blogger.com