What is Microgametogenesis and megagametogenesis?
Megagametogenesis creates the female gametophyte, which is an integral part of pollination, a very prominent process in plants. The male counterpart to megagametogenesis is called microgametogenesis. Microgametogenesis is the process of the formation of the male gametophyte.
What is megagametogenesis 12?
Complete answer: The process of formation of a megaspore mother cell is known as megasporogenesis. The megaspore mother cell or MMC is a large cell containing dense cytoplasm and a prominent nucleus. The MMC undergoes reductional division or meiosis and forms four haploid megaspores.
What is difference between Megasporogenesis and megagametogenesis?
In the megasporogenesis the diploid megaspore mother cell undergoes meiosis to form four haploid megaspores whereas in the megagametogenesis the megaspore develops into female gamete.
What is a Megagametophyte?
megagametophyte. [ mĕg′ə-gə-mē′tə-fīt′ ] The female gametophyte that develops from the megaspores of heterosporous plants. Among heterosporous species of the lycophyte plants, for example, the sporophyte plant produces megaspores stocked with food. These spores grow into megagametophytes that produce eggs.
What is the meaning of Microgametogenesis?
Microgametogenesis is the process in plant reproduction where a microgametophyte develops in a pollen grain to the three-celled stage of its development. In flowering plants it occurs with a microspore mother cell inside the anther of the plant.
What is difference between Microsporogenesis and Microgametogenesis?
Microsporogenesis is the process of formation of pollen grains (microspores) from the sporogenous tissue. Microgametogenesis is the process of formation of male gametes from the generative cell nucleus that is present inside the pollen grain through mitosis.
What is formed in the process of megagametogenesis?
Megagametogenesis is development of the female gametophyte from the haploid product(s) of meiosis. The particular type of megagametogenesis is a function of mitotic divisions, the formation of new cells, and the fusion of existing nuclei or cells.
What is Megasporocyte?
[ mĕg′ə-spôr′ə-sīt′ ] A diploid cell that undergoes meiosis to produce megaspores as part of megasporogenesis. Also called megaspore mother cell.
What are microspores and megaspores?
Microspores are land plant spores that develop into male gametophytes, whereas megaspores develop into female gametophytes. The male gametophyte gives rise to sperm cells, which are used for fertilization of an egg cell to form a zygote.
What are the two differences between Microsporogenesis and Megasporogenesis?
Microsporogenesis involves the formation of microspores from microspore mother cells by meiotic division. Megasporogenesis is the process of arrangement of megaspores from the megaspore mother cell. It occurs inside the pollen sac of the anther.
What is the difference between a Megagametophyte and microgametophyte?
As in other seed plants, the microgametophyte (male, or sperm-producing gametophyte) is highly simplified and called a pollen grain. The megagametophyte (female, or egg-producing, gametophyte) develops within the ovule (immature seed).
What is Microgametogenesis explain with diagram?
What is Microgametogenesis and Microsporogenesis?
What is mega Porogenesis & Microsporgens?
Microsporogenesis involves the formation of microspores from microspore mother cells by meiotic division. Megasporogenesis is the process of arrangement of megaspores from the megaspore mother cell. It occurs inside the pollen sac of the anther. It occurs in the ovule of the ovary.
What is Bisporic development?
Bisporic development results from failure of cytokinesis after meiosis II. As a result, the megaspore tetrad is comprised of two cells each containing two megaspore nuclei. The embryo sac develops from one of these dyad cells by two rounds of mitotic division and the other dyad cell is suppressed.
What are the types of Megasporogenesis?
Angiosperms exhibit three patterns of megasporogenesis: monosporic, bisporic, and tetrasporic, also known as the Polygonum type, the Alisma type, and the Drusa type, respectively.
What is megaspores and microspores?
Microspores are spores that are specifically male and give rise to male gametophytes; megaspores, on the other hand, are specifically female and give rise to female gametophytes.
What is Macrosporogenesis?
[¦mak·rō¦spȯr·ō′jen·ə·səs] (botany) In angiosperms, the formation of macrospores and the production of the embryo sac from one or occasionally several cells of the subepidermal cell layer within the ovule of a closed ovary. Also known as megasporogenesis.
How many megaspores are there?
Four megaspores are formed from the meiotic division of one megaspore mother cell.