What is the 8s gametophyte?
What is the 8s gametophyte?
A gametophyte (/ɡəˈmiːtəfaɪt/) is one of the two alternating multicellular phases in the life cycles of plants and algae. It is a haploid multicellular organism that develops from a haploid spore that has one set of chromosomes. The gametophyte is the sexual phase in the life cycle of plants and algae.
Is the first cell of female gametophyte?
Solution: Megaspore mother cell of megasporangium undergoes meiosis and forms megaspore tetrad out of which one megaspore is functional. So, the functional megaspore serves as the first cell of the female gametophyte.
What is central cell in female gametophyte?
Abstract. The central cell characterizes the angiosperm female gametophyte (embryo sac or megagametophyte) in that it directly participates in “double fertilization” to initiate endosperm development, a feature distinguishing angiosperm from all other plant taxa.
What are the female organs of a gametophyte?
The female gametophyte develops within the ovule and generally consists of three antipodal cells, one central cell, two synergid cells, and one egg cell (Figures 1A and 1B). The female gametophyte is also commonly called the embryo sac or megagametophyte.
Which cells are the initial cells male female gametophyte?
The haploid microspores (n) and megaspores (n) are the initial cells of the male and female gametophytes.
Which among the following is the female gametophyte of angiosperms?
In angiosperms, the female gametophyte is called embryo sac.
What are Antipodals?
Definition of antipodal (Entry 1 of 2) 1 : of or relating to the antipodes specifically : situated at the opposite side of the earth or moon an antipodal meridian an antipodal continent. 2 : diametrically opposite an antipodal point on a sphere. 3 : entirely opposed a system antipodal to democracy.
What is the first cell of a gametophyte generation called?
The first cell of any gametophyte generation is normally a spore (sexual spore/meiospore), and the last cell is normally a gamete. Any cell of a gametophyte generation (n) is usually haploid. The first cell of any sporophyte generation is normally a zygote, and the last cell is normally a sporocyte (meiocyte).
What is meant by Monosporic development of female gametophyte?
The formation of the female gametophyte from a single functional megaspore is called as monosporic development. The nucleus of functional megaspore divides mitotically to form two nuclei which move to opposite poles. This forms a two-nucleate embryo sac.
How many antipodal cells are in the female gametophyte?
The female gametophyte develops within the ovule and generally consists of three antipodal cells, one central cell, two synergid cells, and one egg cell (Figures 1A and 1B). The female gametophyte is also commonly called the embryo sac or megagametophyte.
What is the difference between male and female gametophyte?
The female gametophyte is also commonly called the embryo sac or megagametophyte. The male gametophyte, also called the pollen grain or microgametophyte, develops within the anther and consists of two sperm cells encased within a vegetative cell (Gifford and Foster, 1989).
What is the structure of gametophyte in angiosperms?
The angiosperm gametophytes are composed of few cells and are embedded within the sexual organs of the flower. The female gametophyte develops within the ovule and generally consists of three antipodal cells, one central cell, two synergid cells, and one egg cell (Figures 1A and 1B).
What is the function of ovule in gametophyte?
It contains the egg cell and central cell that become fertilized and give rise to the embryo and endosperm of the seed, respectively. Female gametophyte development begins early in ovule development with the formation of a diploid megaspore mother cell that undergoes meiosis.
