Primarygun Posted October 27, 2005 Share Posted October 27, 2005 All zygotes of human have the same genotype. But, when you consider carefully, starting from the unique cells, each cells divided should have the same structure, what causes them to specialize to carry out different functions? Link to comment Share on other sites More sharing options...
Skye Posted October 27, 2005 Share Posted October 27, 2005 There is no simple answer because there are several ways that it happens. Here's a link to part of a textbook. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Search&db=books&doptcmdl=GenBookHL&term=morphogen+AND+mboc4%5Bbook%5D+AND+374514%5Buid%5D&rid=mboc4.section.3792#3814 Link to comment Share on other sites More sharing options...
cambrian_exp Posted October 27, 2005 Share Posted October 27, 2005 maybe DNA causes cells to become specialized:rolleyes: Link to comment Share on other sites More sharing options...
rakuenso Posted October 27, 2005 Share Posted October 27, 2005 um yes and no... genes are a part of it, but the environment is also responsible. Fetuses can't be developed properly unless they are in the proper womb (which acts as the environment), therefore once again its a nurture vs. nature debate. Post Scriptum: MBoC is a blast to read. You seriously can't get any more monotonous Link to comment Share on other sites More sharing options...
Mokele Posted October 27, 2005 Share Posted October 27, 2005 The short, short answer: The DNA is always the same, but only a subset it expressed, different in each cell type. Link to comment Share on other sites More sharing options...
rakuenso Posted October 28, 2005 Share Posted October 28, 2005 look up embryology, and specifically, eve, hunchback, bicoid and nanos genes responsible for segmentation, it'll clarify some things for you Link to comment Share on other sites More sharing options...
Mokele Posted October 28, 2005 Share Posted October 28, 2005 "HOX" and "PAX" in google should pull up some good stuff too. Link to comment Share on other sites More sharing options...
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