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Q. The internal cavity commonly formed by cell division prior to gastrulation is the

Human Reproduction

Solution:

After the formation of the zygote, it undergoes cleavage that leads to the formation of daughter cells called blastomeres. The embryo with 8 to 16 blastomeres is called a morula. Morula continues to divide and transforms into blastocyst. Blastocyst consists of 64 cells and has a cavity present within the cell mass. This cavity is called blastocyst cavity or blastocoel. Implantation takes place at blastocyst stage. Gastrulation is the transformation of implanted blastocyst into gastrula which forms three germ layers by rearrangement of the cells.