受精卵发育过程

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1、The origin of life the process of fetal development 受精卵发育过程受精卵发育过程Page 2Life is amazing23The process of fetal developmentoospermoospermThe number of cells increases The number of cells increases by ossperm fissuring.by ossperm fissuring.it is consist of sperm it is consist of sperm and ovum and ovum

2、 cleavage cleavage stagestage4when the number ofwhen the number ofcells increases to cells increases to 32,it is called 32,it is called morula because it morula because it looks like mulberry.looks like mulberry.Every cell isEvery cell is all-round. all-round.5Cells break up intoCells break up intoa

3、ll kinds of cells .all kinds of cells .These cells haveThese cells havedifferent functions.different functions.inner cell blastocele plasmodiblastinner cell blastocele plasmodiblastinner cell blastocele plasmodiblastinner cell blastocele plasmodiblastmass mass mass mass 6ectodermmesodermendodermThe cells continue to divide, migrate, and gradually form some organs. 789