How many mitotic divisions are required to form a mature embryo sac?
Answers
There are three mitotic divisions to form a mature embryo sac from megaspore mother cell.
Explanation:
Mitosisis defined as a process in which a mother cell undergoes cell divison to produce two new daughter cells which are genetically identical to parent cell.
The mitosis process begins when megaspore mother cell undergoes the process of meiosis and produces 4 haploid cells. 3 haploid cells out of them degenerates and only 1 survive because only cytoplasm is transferred to completely to one cell only. The inner cell of haploid cell grows and enlarges the size of embryo sac and the haploid nucleus undergoes first mitosis division and forms 2 haploid nuclei. These 2 haploid nucleus undergoes second mitosis division and forms 4 haploid nuclei. These 4 haploid cells undergoes thirs mitosis division and produces 8 haploid nuclei. The nuclei are then separated and identified as chromosomes and attached opposite to each other at bottom of the cell called female gamete or ovum and leave with two polar nuclei. it furthure mature and forms mature embryo sac.
Hence the megaspore cell undergoes 3 mitotic divisons to form a mature embryo sac.
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