Search results
Results from the WOW.Com Content Network
For a list of companies based within Dallas city limits, go to List of companies in Dallas. The Dallas/Fort Worth Metroplex is home to over 20 corporate headquarters, making the Dallas/Fort Worth Metroplex one of the largest corporate headquarters concentration in the United States.
This list includes companies based within the city limits of Dallas, Texas. Although the Dallas-Fort Worth Metroplex has many more corporate headquarters, including Frito Lay and American Airlines, this list only includes companies that are headquartered within the Dallas City Limits. Affiliated Computer Services; Alon USA; AT&T; Atmos Energy ...
This page was last edited on 16 February 2024, at 23:03 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Oogonium (larger) and antheridium (with red centre) of the alga Chara, produced on the stem of a plant Magnified view of developing antheridia in Hypnum cupressiforme "Moss flowers": each shoot has a cluster of antheridia, i.e., an androecium.
Germ cells are specified early in development [4] and can only differentiate into gametes. [5] The segregation of germ cells is often determined by the species, with some undergoing preformation, where the germ cells are determined by maternally inherited factors before or immediately after fertilisation, and others undergoing epigenesis, where the germ cell lineage is determined from ...
In phycology and mycology, oogonium refers to a female gametangium if the union of the male (motile or non-motile) and the female gamete takes place within this structure. [ 12 ] [ 13 ] In Oomycota and some other organisms, the female oogonia, and the male equivalent antheridia , are a result of sexual sporulation, i.e. the development of ...
Oogonium: diploid/46: 2C: Oocytogenesis : third trimester primary Oocyte: diploid/46: 4C: Ootidogenesis (meiosis 1) (Folliculogenesis) -- polar body separated: Dictyate in prophase I until ovulation secondary Oocyte: haploid/23: 2C: Ootidogenesis (meiosis 2) -- polar body separated: Halted in metaphase II until fertilization Ootid: haploid/23 ...
The female organ, called an oogonium is a large oval structure with an envelope of spirally arranged, bright green filaments of cells. The male organ or is also large, bright yellow or red in colour, spherical in shape, and is usually termed an antheridium , though some workers regard it as a multiple structure rather than a single organ.