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V动物身体图式的模式建成II.pptx

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-posterioranddorso-(Xenopus)--rightaxis(left-ans)Allvertebrates,despitetheirmanyoutwarddifferences,haveasimilarbasicbodyplanTheskeletonofamouseembryoillustratesthevertebratebodyplanTheAPaxis:head,trunkwithpairedappendages(vertebralcolumn脊柱)andthepost-analtailThevertebralcolumnisdividedintocervical(neck),thoracic(chest),lumbar(lowerback),andsacral(hipandlower)regionsTheDVaxis:themouthdefiningtheventralsideandthespinalcordthedorsalsidePatterningthebodyplaninvertebratesEarlydevelopmentinDrosophilaislargelyunderthecontrolofmaternalfactorsthatsequentiallyactivateadifferentsetsoftheembryo’sowngenes(zygoticgenes),,,,HansSpemannandHildeMangoldshowedthatthedorsallipoftheblastoporecaninducethehost’sventraltissuestoformasecondembryowithclearantero-posterioranddorso----anizerspecifiedandformed?Whatcausedthedorsalblastoporeliptodifferfromanyotherregionoftheembryo?anizertocreatetheantero-posterioranddorso-ventralaxes?panied?Thedevelopmentallyimportantmaternalfactorsaredifferentiallylocalizedalongtheanimal-vegetalaxisintheXenopusunfertilizedeggsTheXenopuseggpossessesadistinctanimal-vegetalaxis,withmostofthedevelopmentallyimportantmaternalproducts(mRNA/proteins)localizedinthevegetal

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