Question

what is megasporogenesis?
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Answer 1

Megasporogenesis refers to the development of megaspores from the megasporocyte, the cell that undergoes meiosis. Meiosis of the megasporocyte nucleus results in the formation of four haploid megaspore nuclei. In most taxa, meiosis is followed by cytokinesis, resulting in four megaspore cells. This pattern is termed monosporic megasporogenesis; because of the four megaspores produced, only one of them contributes to the female gametophyte (Figures 11.9, 11.10A–D). In some angiosperm taxa, however, cytokinesis occurs after the first meiotic division, but not the second, resulting in two cells, each of which contain two haploid nuclei. This developmental pattern is termed bisporic megasporogenesis because one of the binucleate cells, containing two megaspore nuclei, contributes to the female gametophyte (Figure 11.9). Finally, in other taxa cytokinesis does not occur at all after meiosis, resulting in a single cell with four haploid nuclei. Because all four haploid megaspore nuclei contribute to the female gametophyte, this pattern is termed tetrasporic megasporogenesis

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