In humans, a normal ovum can carry only an X chromosome (of the X and Y chromosomes), whereas a sperm may carry either an X or a Y (a non-normal ovum can end up carrying two or no X chromosomes, as a result of a irregularity at either of the two stages of meiosis, while a non-normal sperm cell can end up carrying either no sex-defining chromosomes, an XY pair, or XX pair as a result of the forementioned reason); ergo the male sperm can play a role in determining the sex of any resulting zygote, if the zygote has two X chromosomes it may develop into a female, if it has an X and a Y chromosome, it may develop into a male.
Artificial gametes, also known as In vitro derived gametes (IVD), stem cell-derived gametes (SCDGs), and In vitro generated gametes (IVG), are gametes derived from stem cells.
Additionally, this technique could be used for human enhancement by selectively breeding for a desired genome or by using recombinant DNA technology to create enhancements that have not arisen in nature. However, since plants have an alternation of diploid and haploid generations some differences exist.
In flowering plants the flowers use meiosis to produce a haploid generation which produce gametes through mitosis.
The haploid pollen then produces sperm by mitosis and releases them for fertilization.AVACS Live Chat - free dating chat application for mobile phones and PC computers with photos, animated smiles, avatars, own rooms, personal messages, contact list, exchange of photos, music and files, with colourful messages and more more more... Your messages, photos, voice and other information encrypted with 128-bit key cipher algorithm.More information about chat Open chat from computer Download chat from mobile phone Our banners on your site Reviews devoted to AVACS Live Chat: by freechatrooms Short help about chat in English and Arabic Forums about AVACS Live Chat: General Forum International forum English and Indonesian forum Arabic forum Urdu forum Hindi & Urdu forum Indian Support Forum Bangla forum Persian forum Iranian forum Arabic forum by Shevoo Arabic forum by an Jam Our partners: Mobile Wave - romanian mobile portal Purchase, sale, exchange, repair cars in Portugal Other sites: AVACS company site AVACS Live Chat - alternative site Video help about chat AVACS Live Chat - arabic site AVACS Live Chat - iraqian site AVACS Live Chat - indian site AVACS Live Chat - bangladesh site AVACS Live Chat - urdu site AVACS Live Chat - pakistani site Free Chat Sites 19 Jan, 2009 Added list of users smiles, so you can upload share and use your own smiles.Customer hosted ESChat is available for those that desire tomaintain their own PTT servers.For Business and Government pricing, please contact an ESChat Sales Representative at 805-541-5044.