How many meiotic and mitotic divisions are required for the formation of female gametophyte from functional Megaspore respectively?
The female gametophyte, also known as embryo sac, develops within the ovule [1,2]. A region called the nucellus gives rise to a single pre-meiotic cell—the megaspore mother cell (MMC). MMC undergoes two meiotic divisions resulting in four haploid megaspores.
How many meiotic and mitotic divisions are required for the formation of female gametophyte in angiosperms?
Thus, one meiotic division produces one matured female gametophyte in an angiosperm. Hence, 101 meiotic divisions are required to produce 101 female gametophytes in an angiosperm. The life cycle of flowering plants reveals a predominant sporophyte and reduces gametophytes.
How many mitotic divisions are required for the formation of two male gametes from one pollen grain?
Formation of two male gametes from a pollen grain require two mitotic divisions.
How many mitotic divisions are required for conversion of the Megaspore to the female gametophyte?
the megaspore undergoes 3 mitotic divisions to form the embryo sac, a female gametophyte.
How many mitotic divisions are required for development of female gametophyte?
From the remaining functional megaspore, the megagametophyte (also known as female gametophyte or embryo sac) develops by three mitotic divisions, at the mature stage consisting of 8 nuclei and 7 cells (one egg cell, two synergids, one central cell and three antipodals).
How many mitotic divisions take place during development of female gametophyte?
For female gametophyte development, only one functional megaspore out of the four megaspores survives, and it undergoes three rounds of mitotic divisions and subsequent cellularizations to produce a seven-celled mature embryo sac, also termed the female gametophyte (Yang and Sundaresan, 2000; Drews and Yadegari, 2002).
How many divisions take place in the formation of female gametophyte?
The mature female gametophyte is formed after two mitotic divisions and the process of cellularization of the coenocytic embryo sac (Maheshwari 1950). Its final structure is similar to that of a normal Polygonum-type embryo sac.
How many meiotic and mitotic divisions are required respectively to from 100 male gametes in angiosperms?
100 male gametes are developed from 100 microspores (from 25 meiotic divisions) and 100 eggs are developed from 100 megaspores (from 100 meiotic division). Hence, number of meiotic divisions necessary for 100 zygotes formation = 25 + 100 = 125.
How many meiotic and mitotic divisions are required for the formation of 100 seeds?
So, for the development of 100 megaspores 100 meiotic division is required. – So, by the fusion of 100 microspores and 100 megaspores, 100 seeds are formed. – Hence for the 100 seed production 200 meiotic division takes place in the Cyperaceae family. Hence, the correct answer is option (D).