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Question
Which cell division is found during cleavage?
Which cell division is found during cleavage?
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Solution
The correct option is C Closed mitosis
Shortly after fertilization, the zygote undergoes cleavage, a series of rapid mitotic divisions with no period of growth during each cell cycle. For this reason, although the cell number increases, the embryo does not increase in size. The type of cell division is closed mitosis in which the nuclear membrane remains intact. The zygote initially divides to form a 2-celled embryo. Then each of these cells undergoes mitosis and divides, bringing the number of cells to 4. Repeated divisions increase the number of cells, called as blastomeres, that make up the embryo. At about the 32-cell stage the embryo is a solid ball of blastomeres, called as morula. Eventually, anywhere from 64 to several hundred blastomeres form the blastula, which is usually a hollow ball with a fluid-filled cavity, the blastocoel.
Shortly after fertilization, the zygote undergoes cleavage, a series of rapid mitotic divisions with no period of growth during each cell cycle. For this reason, although the cell number increases, the embryo does not increase in size. The type of cell division is closed mitosis in which the nuclear membrane remains intact. The zygote initially divides to form a 2-celled embryo. Then each of these cells undergoes mitosis and divides, bringing the number of cells to 4. Repeated divisions increase the number of cells, called as blastomeres, that make up the embryo. At about the 32-cell stage the embryo is a solid ball of blastomeres, called as morula. Eventually, anywhere from 64 to several hundred blastomeres form the blastula, which is usually a hollow ball with a fluid-filled cavity, the blastocoel.
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