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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. At least one of the spores develop into haploid female gametophytes, the megagametophytes. [1] The megaspore mother cell arises within the megasporangium tissue.
During megasporogenesis, a diploid precursor cell, the megasporocyte or megaspore mother cell, undergoes meiosis to produce initially four haploid cells (the megaspores). [1] Angiosperms exhibit three patterns of megasporogenesis: monosporic, bisporic, and tetrasporic , also known as the Polygonum type, the Alisma type, and the Drusa type ...
This megasporocyte undergoes meiotic cell division to form four cells that are haploid. Three cells die and one that is most distant from the micropyle develops into the megaspore. This megaspore becomes larger and the nucleus of it undergoes mitosis three times until there are eight nuclei. These eight nuclei are then arranged into two groups ...
The name POEMS is an acronym for some of the disease's major signs and symptoms (polyneuropathy, organomegaly, endocrinopathy, myeloma protein, and skin changes), as is PEP (polyneuropathy, endocrinopathy, plasma cell dyscrasia). The signs and symptoms of most neoplasms are due to their mass effects caused by the invasion and destruction of ...
Signs and symptoms of this progressive disease tend to become more marked as the child ages. Later, the condition causes wrinkled skin, kidney failure, loss of eyesight, and atherosclerosis and other cardiovascular problems. [12] Scleroderma, a hardening and tightening of the skin on trunk and extremities of the body, is prevalent.
Multiple sulfatase deficiency (MSD), also known as Austin disease, [1] or mucosulfatidosis, [1] is a very rare autosomal recessive [2] lysosomal storage disease [3] caused by a deficiency in multiple sulfatase enzymes, or in formylglycine-generating enzyme, which activates sulfatases.
In hematology, plasma cell dyscrasias (also termed plasma cell disorders and plasma cell proliferative diseases) are a spectrum of progressively more severe monoclonal gammopathies in which a clone or multiple clones of pre-malignant or malignant plasma cells (sometimes in association with lymphoplasmacytoid cells or B lymphocytes) over-produce and secrete into the blood stream a myeloma ...
A genetic defect in cell-mediated immunity may cause a person to be susceptible to develop leprosy symptoms after exposure to the bacteria. [59] The region of DNA responsible for this variability is also involved in Parkinson's disease , giving rise to current speculation that the two disorders may be linked at the biochemical level.