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Furtherdevelopment2.HOWSCIENTISTSCLONECELLSB.BlastocystDivision Inblastocystdivision,scientistsallowafertilizedeggtodivideuntilitformsamassofabout32to150cells,knownasablastocyst.Scientiststhensplittheblastocystintwoandimplantthetwohalvesintotheuterusofasurrogatemother.Thetwohalvesdevelopasidenticaltwins.C.SomaticCellNuclearTransfer Whileblastomereseparationandblastocystdivisionproduceanimalscontainingthegeneticmaterialfrombothamotherandfather,somaticcellnucleartransferproducesananimalcarryingthegeneticmaterialofonlyoneparent.Inthistechnique,scientiststransferthegeneticmaterialfromadonor’ssomaticcell(anybodycellotherthananeggorspermcell)toanenucleatedeggcell—thatis,aneggcellwithitsnucleus,andthusitsgeneticmaterial,removed.Theresultingclonedcellcontainsthegeneticmaterialofthedonor’ssomaticcell.GeneticEngineeringFirstClonedCatIdenticalCalves