-posterioranddorso-ventralaxisinDrosophilaoocyte(体轴建立的设定)(Xenopus)-posteriorpatterning(themesodermalderivative)(theectodermalderivative)-rightaxis(left-ans)Thebodyaxesarespecifiedduringmid-enesAllvertebrates,despitetheirmanyoutwarddifferences,haveasimilarbasicbodyplanTheskeletonofamouseembryoillustratesthevertebratebodyplanTheAPaxis:head,trunkwithpairedappendages(vertebralcolumn脊柱)andthepost-analtailThevertebralcolumnisdividedintocervical(neck),thoracic(chest),lumbar(lowerback),andsacral(hipandlower)regionsTheDVaxis:themouthdefiningtheventralsideandthespinalcordthedorsalsideLeft-rightsymmetry:whilethevertebratebodyisoutwardlysymmetricwithrespecttotheleftandrightsides,anssuchastheheartandliverarearrangedasymmetricallywithrespecttothedorsalmidlinePatterningthebodyplaninvertebratesEarlydevelopmentinDrosophilaislargelyunderthecontrolofmaternalfactorsthatsequentiallyactivateadifferentsetsoftheembryo’sowngenes(zygoticgenes),,theyariseprogressivelythroughasequenceofinductiveinteractionsbetweenneighboringcells(cellinduction).anizer(胚胎组织者)-posterioranddorso-ventralaxisinDrosophilaoocyte(体轴建立的设定)
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