Question: Early cleavage in a sea urchin embryo results in a hollow blastula. While early cleavage in mamma…


Early cleavage in a sea urchin embryo results in a hollow blastula. While early cleavage in mammals includes a compaction event followed by division resulting in an outer layer and an inner layer of cells. Diagram the important differences in sea urchin and mammalian mitotic spindle location and cleavage that results in 2 different looking embryos, a hollow ball for the sea urchin and an ICM and trophoblast in mammals. Describe why this is important for the mammalian embryo.

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Early cleavage in a sea urchin embryo results in a hollow blastula. While early cleavage in mammals includes a compaction event followed by division resulting in an outer layer and an inner layer of cells. Diagram the important differences in sea urchin and mammalian mitotic spindle location and cleavage that results in 2 different looking embryos, a hollow ball for the sea urchin and an ICM and trophoblast in mammals. Describe why this is important for the mammalian embryo.

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