Relative sizes of an egg cell,morula,blastula | vedclass

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(A) During early embryonic development,the total volume of the embryo remains relatively constant because the cells undergo cleavage divisions without

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Egg cell is largest and morula is smallest

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(A) During early embryonic development,the total volume of the embryo remains relatively constant because the cells undergo cleavage divisions without significant growth between divisions.However,the initial egg cell (ovum) is a single,large cell containing a significant amount of cytoplasm.As the zygote undergoes cleavage,it forms a morula,then a blastula,and finally a gastrula.While the number of cells increases significantly,the overall size of the embryo does not increase until implantation occurs in the uterus.Therefore,the egg cell is the largest single unit,and as cleavage progresses,the individual cells (blastomeres) become smaller,but the overall structure remains constrained within the zona pellucida until hatching,making the egg cell the largest and the morula the smallest in terms of individual cell size and initial structural volume before growth begins.

Relative sizes of an egg cell,morula,blastula,and gastrula are:

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