Compare the phenomenon of fertilization of Ectocarpus and polysiphonia. long question
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The zygote will divide into a morula once eight or more cells are created. The morula is still characterized by cellular cleavage, and does not increase beyond the size of the original zygote cell. Eventually, the morula develops into a blastula, characterized by the introduction of the G2 phase in the cell cycle. This allows for growth and development of the cells before subsequent divisions. The blastula develops a fluid-filled cavity known as the blastoceole, and is given the name blastocyst. The blastocyst will then grow into a gastrula after gastrulation, and later a neurula (after neurulation).
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