tag:blogger.com,1999:blog-6363709380080617997.post3492061919625334700..comments2023-08-25T17:40:46.656+03:00Comments on Random Thoughts: Genographic Project Update IIIPijushhttp://www.blogger.com/profile/06687925642301965831noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-6363709380080617997.post-92006132220566097722007-07-06T13:28:00.000+03:002007-07-06T13:28:00.000+03:00THANKS FOR VISITING AND GOOD WRITINGSTHANKS FOR VISITING AND GOOD WRITINGSRaghu Ram Prasadhttps://www.blogger.com/profile/16307853771913623456noreply@blogger.comtag:blogger.com,1999:blog-6363709380080617997.post-79164228006016769402007-07-04T13:04:00.000+03:002007-07-04T13:04:00.000+03:00your collection is very beautiful and very interst...your collection is very beautiful and very intersting........thanks for giving good informationRaghu Ram Prasadhttps://www.blogger.com/profile/16307853771913623456noreply@blogger.comtag:blogger.com,1999:blog-6363709380080617997.post-66264780243281784912007-06-28T02:16:00.000+03:002007-06-28T02:16:00.000+03:00woow it is fun to imagine our ancestors in middle ...woow it is fun to imagine our ancestors in middle east and africa!!<BR/>some scholars say japanese language is rooted from african language too :)<BR/>coz there are so many words in common.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6363709380080617997.post-90192953103074664542007-06-27T16:44:00.000+03:002007-06-27T16:44:00.000+03:00@Kalyan, I visited the NG site too and it also con...@Kalyan, I visited the NG site too and it also contains some interesting info. Another thing that I want to mention is one can participate in this project by submitting his DNA sample (however not free) <BR/><BR/>@Ajeya, ThanksPijushhttps://www.blogger.com/profile/06687925642301965831noreply@blogger.comtag:blogger.com,1999:blog-6363709380080617997.post-16650265048935469732007-06-27T11:32:00.000+03:002007-06-27T11:32:00.000+03:00Dear Umesh, Thanks for introducing me with this in...<B>Dear Umesh, <BR/><BR/>Thanks for introducing me with this interesting subject. Though I am not a bio student, I find it extremely interesting and jotted down my understanding below. Please feel free to challenge me, so that I can learn more on this.</B><BR/><BR/><I>Y So Lonely?</I><BR/>Unlike the twenty-two pairs of autosomes, there is no recombination between the X and most of the Y chromosome. Genes on the part of the Y chromosome that does not recombine will be passed from father to son.. (First link)<BR/>The fact that it doesn't have a matching pair poses a bit of a problem for the Y chromosome. <BR/>Over time, mistakes have crept into the Y chromosome, too. But every time a gene on the Y chromosome went bad, it basically disappeared. Scientists theorize that the X and Y chromosome started out with about the same amount of genes -- about 1,000. Today, the Y chromosome has less than 80 genes. (Second link)<BR/><BR/><I>Hope for Y's Future</I><BR/>Some geneticists think the Y chromosome is now little more than a genetic wasteland that will eventually just disappear. If that were to happen, it would certainly spell the end of sexual reproduction. (Second Link)<BR/><BR/><B>Now your Question is “If gene deletion by natural selection if it is correct why there is preservation of X chromosome size when it has only 50% Chance to exchange with its real partner. It should also have 50% disadvantage. How is this?”</B><BR/><BR/><I>My analysis: <BR/>1)First of all X always has a pair in female. So it has not suffered the problem of recombination, thus able to hold most of the genes intact.<BR/>2)At this point of time Y lost most of the genes, so the only way to preserve the genes can be done through X, i.e, the size should be kept intact. This explains why X should be preserved. <BR/>3)I think it has nothing to do with the exchange, but I am not sure about it. <BR/>4)Having a single copy of any chromosome other than the X or the Y is lethal in humans; however, only one X chromosome is needed for normal development to occur. (First link)<BR/>May be this is the reason for the preservation of X.</I><BR/><BR/><B>I have not able to found the section in the website where it has described the preservation topic, will be helpful if you can provide me with the link of that section<BR/><BR/>Thanks again for coming here and sharing your thoughts.<BR/><BR/>With Rds,<BR/>Pijush</B>Pijushhttps://www.blogger.com/profile/06687925642301965831noreply@blogger.comtag:blogger.com,1999:blog-6363709380080617997.post-72704708066849760702007-06-26T11:32:00.000+03:002007-06-26T11:32:00.000+03:00I came to know about the genographic project a yea...I came to know about the genographic project a year or two back through the National Geographic channel & it interested me immensely, though I was not into in depth study, but now I'm getting to learn more. The National Geographic website on Genographic project also provides a lot of information about this study. Isn't it very interesting to know our roots & the diversity!Kalyan Panjahttps://www.blogger.com/profile/00806730473428069202noreply@blogger.comtag:blogger.com,1999:blog-6363709380080617997.post-19249490760496503792007-06-26T07:20:00.000+03:002007-06-26T07:20:00.000+03:00Good Info there.Good Info there.AJEYA RAOhttps://www.blogger.com/profile/15770471904480140472noreply@blogger.comtag:blogger.com,1999:blog-6363709380080617997.post-42076102331092087212007-06-26T07:06:00.000+03:002007-06-26T07:06:00.000+03:00Since You have posted on Y chromsome I have proble...Since You have posted on Y chromsome I have problem in connection that<BR/>Please check out this <BR/>http://www.learner.org/channel/courses/biology/textbook/gender/gender... <BR/>http://www.npr.org/templates/story/story.php?storyId=4225769&sc=emaf <BR/>I read that size of Y chromosome has reduced because it did not have <BR/>partner at all. but X chromosome has not reduced, they say that it is <BR/>because, it has partner in female sex to recombine. <BR/>If Chromosome don't get partner to recombine than there is tendency to <BR/>delete genes which may be harmful produced by mutation. which intern <BR/>will reduce the size of chromosome is the logic. <BR/>Now if X chromosome gets only 50% chances to recombine then I think <BR/>size of X chromosome should also reduce to a size in between Y and its <BR/>initial size in reptiles <BR/>If gene deletion by natural selection if it is correct why there is <BR/>preservation of X chromosome size when it has only 50% Chance to <BR/>exchange with its real partner. It should also have 50% disadvantage. <BR/>How is this? <BR/>This is my guess. Please comment.Umesh R Bilagihttps://www.blogger.com/profile/15150259584342669656noreply@blogger.com