what is the cleavage? describe the formation of morula blastula in the mammals
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Cleavage is the successive mitotic division of egg.
Cleavage results in formation of solid mass of cells which is called Morula, having 8-16 cells. Morula undergoes compaction. it descends slowly towards uterus in 4-6 days. as it enters the uterus it gets rich supply of nutrients. outer peripheral cells enlarge and flatten. they form trophoblast. Trophoblast cells secrete a fluid into the interior creating a cavity called blastocoel. And thus the Morula is converted into Blastula, which is called Blastocyst in mammals.
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