A megaspore mother cell, or megasporocyte, is a diploid cell in plants in which meiosis will occur, resulting in the production of four haploid megaspores.
Why is megaspore mother cell diploid?
– A megaspore mother cell is a diploid cell in plants. These megaspore mother cells undergo meiosis division resulting in the production of four haploid megaspores. Out of four only one megaspore develops into haploid female gametophyte at maturity and the other three soon degenerate.
Why is megaspore haploid?
1. Mature diploid sporophyte undergoes meiosis to produce haploid unicellular microspores and megaspores. … The haploid megaspore undergoes three rounds of mitotic divisions that result in eight haploid nuclei contained in seven cells: Two synergids, one egg cell, a central cell with two nuclei, and three antipodals.
What ploidy is a megaspore?
Nucellus, microspore mother cells (MMC), and megaspore mother cells are part of sporophyte so these are diploid cells and their ploidy is 2n.
How is megaspore mother cell is formed?
The megaspore mother cell arises within the megasporangium or ovule. One of the cells of the nucellus towards the micropylar region of the ovule differentiates into the megaspore mother cell or MMC. … In most plants, only one of these megaspores is functional and develops into an embryo sac or female gametophyte.
Is Synergid haploid or diploid?
Synergids are the two nuclei in the embryo sac of flowering plants that are closely associated with the oosphere or egg cells, to form the egg apparatus. They are haploid.
What is megaspore mother cell in Gymnosperm?
In gymnosperms and flowering plants, the megaspore is produced inside the nucellus of the ovule. During megasporogenesis, a diploid precursor cell, the megasporocyte or megaspore mother cell, undergoes meiosis to produce initially four haploid cells (the megaspores).
Are Synergid cells diploid?
Synergids are produced by the mitotic division in the haploid megaspore of a diploid plant. So synergids of a diploid plant are haploid.
What is the ploidy of functional megaspore cell and megaspore mother cell?
Answer by Isha Agarwal
Nucellus , microspore mother cells (MMC), and megaspore mother cells are part of sporophyte so these are diploid cells and their ploidy is 2n while female gametophytes are part of gametophyte and ploidy is n .
Is megaspore female gametophyte?
Angiosperms, or flowering plants, are heterosporous, producing two types of spores that develop into two types of unisexual gametophytes. The first spore type is the megaspore. … The female gametophyte is also commonly called the embryo sac or megagametophyte.
How many megaspore mother cell becomes differentiated in an ovule of angiosperm?
A cell in the ovule differentiates into a megaspore mother cell. The megaspore mother cell is diploid. This megaspore mother cell undergoes meiosis to form. 3 of the 4 megaspores degenerate and only one megaspore is left in each ovule.
How many megaspore mother cells are produced in a nucleus?
Megasporogenesis. 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.
What is the ploidy of functional megaspore in flowering plants?
Its ploidy is 2n. MMC (produces haploid gametophytes by meiotic division) Since, it undergoes meiotic division its ploidy is 2n. Female gametophytes also called as embryo sac (produced by meiotic division from Megaspore mother cell) has ploidy n. Similarly, the functional megaspore is haploid in nature.
Is the megaspore mother cell 2n?
The nucellus is the central part of the ovule containing the embryo sac and is diploid, and megaspore mother cell is the one which is going to form 4 haploid megaspores by meiosis so again being a parent cell their ploidy is 2n.
What happen to haploid megaspores formed by megaspore mother cell in an angiosperm?
“What is the fate of haploid megaspores formed by the megaspore mother cell in an angiospermic plant?” Megaspore mother cell gives rise to four haploid megaspores. Out of these four, one becomes functional and develops into embryo sac and the remaining three undergo degeneration.
Is megaspore a Gametophyte?
A spore that gives rise to a female gametophyte and is larger than a microspore. A haploid spore, usually larger than a microspore of the same plant, which gives rise to a female gametophyte: found in all vascular plants that have differentiated sexes in the gametophyte.