1 meiosis and 2 mitosis.
How many mitotic and meiotic division takes place while the formation of the sac from the functional Megaspore?
1 meiosis and 2 meiosis.
How many mitotic division takes place for the complete development of embryo sac?
1 meiosis and 2 mitosis.
How many meiotic and mitotic divisions takes place for the formation of a single female gametophyte from Megaspore mother cell?
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 divisions are needed for embryo sac?
Hence, for 40 embryo sacs, 40 reductional divisons are required.
How many mitotic divisions are required for the formation of 100 pollen grains?
One meiotic division in a pollen mother cell gives rise to 4 microspores, which develop into 4 pollen grains, therefore 25 meiotic divisions are required to produce 100 pollen grains.
How many free nuclear divisions does the nucleus of a functional megaspore undergo to Form 8 nucleated embryo sac?
The functional megaspore is the first cell of female gametophyte. The cell enlarges and undergoes three free nuclear mitotic divisions. The first division produces two nucleate embryo sac. The two nuclei shift to the two ends and divide twice forming four nucleate and then eight nucleate structure.
How many embryo sacs are present in an ovule?
It is the part of the plant where the seed formation occurs. The embryo sac or which is also called as the female gametophyte is an oval structure which is situated in the ovule of flowering plants. – There is only one egg in an embryo sac. – Number of embryo sacs present in an ovule is one.
How many meiotic and mitotic divisions are required for the formation of male gametophyte?
Hence, one meiotic division and two mitotic division are required for the formation of fully mature male gametophyte from microspore mother cell in angiosperm.
How many types of embryo sacs are there?
Based on the number of megaspores, embryo sacs can be divided into three types: monosporic, bisporic, and tetrasporic (Web Figure 21.3.
How many mitotic division takes place for complete development of female gametophyte in angiosperms?
This nucleus undergoes two rounds of mitosis, producing a four-nucleate coenocyte, with two nuclei at each pole separated by a large central vacuole (stage FG4).
How many mitotic divisions are required for the formation of 100 mature embryo sac?
There are three mitotic divisions to form a mature embryo sac from megaspore mother cell.
How many meiotic and mitotic division are required for the formation of 10 female gametophyte in angiosperms?
The number of meiotic and mitotic divisions necessary for development of female gametophyte in angiosperms is 1 meiosis and 3 mitosis.