 |
|
|
|
March 10th, 2011
04:40 PM ET
More about penis evolutionBy now you might've read about new research on the genes involved in the evolution of the human penis. With more than 2,200 comments, our Wednesday story was a talker. And it wasn't an excuse to say the p-word. Scientists have published a study in the esteemed, peer-reviewed journal Nature that happens to talk about penises. Specifically, they looked at DNA sequences among humans and primate relatives that basically serve as "switches" for other genes. They focused on two switches that humans lack, but that chimpanzees have. One of these switches, the researchers believe, makes chimpanzees have whiskers and what they call "spines" on the penis. And the other relates to the brain - the absence of a particular DNA strand allowed the human brain to grow larger than the chimpanzee's, the researchers theorize. But you didn't click on this headline, or the other one, to learn more about brains, now did you! So, back to what you came here for. It turns out that there's some disagreement about the role of the primate male anatomy discussed in this research. As some of you noted in the comments, there are still many open questions when it comes to exactly how primates, including humans, evolved the way they did. Yesterday, I had an e-mail chat with Christine Drea at Duke University, who studies mammalian social behavior and reproductive development. She sent me all kinds of detailed photos to illustrate differences in penis anatomy among primates. And there is a lot of variation. In her view, the word "spines" may not be the right term for the small bumps that chimpanzees have. Other creatures such as cats have the more spike-like protrusions because the females of these species need appropriate stimulation from the male to ovulate. But primates ovulate spontaneously, so we wouldn't need spines for that purpose. And, as I wrote yesterday, one idea about the function of the spines is that they can help the male pull out the sperm of another male that has previously mated with a female. But in chimpanzees and their relatives, their small bumps wouldn't be able to remove a competitor's semen in the same way, Drea said. In fact, chimps have unusually large testicles that produce large quantities of sperm, which do serve as a means of competition among males to get a female pregnant. Also, in some primates, such as lemurs, sperm coagulates into "plugs" that can be pulled out with the spines; human semen does not do this, so we wouldn't be expected to have spines to remove it. So, what are the bumps on chimp penises for? It's all speculation, but those of you (and there were many!) who joked about being "ribbed for her pleasure" may not be far off, as one explanation for the structures in chimps and other primates may be just that. They could be an "internal courtship device," Drea says.
Next entry »How can I lose weight if I have hypothyroidism?
« Previous entryCancer survivor numbers are up
|
  About this blog
Get a behind-the-scenes look at the latest stories from CNN Chief Medical Correspondent, Dr. Sanjay Gupta, Senior Medical Correspondent Elizabeth Cohen and the CNN Medical Unit producers. They'll share news and views on health and medical trends - info that will help you take better care of yourself and the people you love.
 |
|
|
|
I wish to write articles based on the information collected through some copyright books. I won't copy – paste the material but edit or modify it in such a way that the meaning remains the same. I would also give credit to the books and their authors. Am I breaking any copyright laws?.
https://twitter.com/straininfoonli1
I agree with your opinion. From now on I will always support you.
https://www.orlandoweekly.com/orlando/christinis-ristorante-italiano/Location?oid=2292646
Hello, you used to write wonderful, but the last several posts have been kinda boring?K I miss your super writings. Past few posts are just a bit out of track! come on!
http://www.zortilonrel.com/
vi0a8 uc9gk wdzm
I have been absent for some time, but now I remember why I used to love this web site. Thank you, I'll try and check back more frequently. How frequently you update your site?
https://www.electricpercolatorcoffeepot.com/10-top-coffee-bloggers/
Usually I never comment on blogs but your article is so convincing that I never stop myself to say something about it. You're doing a great job Man,Keep it up.
https://www.snntv.com/story/43461794/signature-window-washing-company-celebrates-6-years-in-business
nice information for a new blogger. it is really helpful
https://www.americanrodeo.com/story/43461794/signature-window-washing-company-celebrates-6-years-in-business
thanks for sharing!
https://lifestyle.koltcountry.com/story/43461794/signature-window-washing-company-celebrates-6-years-in-business
Impressive! Thanks for the post
https://lifestyle.thepodcastpark.com/story/43461794/signature-window-washing-company-celebrates-6-years-in-business
Your writing style has been surprised me. Thank you, quite great article.
https://midplains.newschannelnebraska.com/story/43461794/signature-window-washing-company-celebrates-6-years-in-business
Your writing style has been surprised me. Thank you, quite great article.
https://northeast.newschannelnebraska.com/story/43461794/signature-window-washing-company-celebrates-6-years-in-business
Interesting stuff to read. Keep it up.
https://italianrestaurantorlando.tumblr.com/post/646006119207239680/what-should-you-consider-when-choosing-an-italian
Thank You for your information
https://www.behance.net/gallery/115707363/Finding-Your-Favorite-Italian-Restaurant-in-Your-Area
Great article. Couldn't be write much better! Keep it up!
https://diigo.com/0k0eg0
Fairly high-quality explanation. continue the good work
https://christinisristoranteitaliano.wordpress.com/2021/03/24/italian-restaurants-are-the-best-places-to-go-for-a-night-out/
A great read. I'll definitely be back.
https://www.scoop.it/topic/why-would-you-need-tree-removal-services
Really very happy to say,your post is very interesting to read.I never stop myself to say something about it.You're doing a great job.Keep it up
https://www.behance.net/gallery/116097987/Top-Tree-Trimming-Services-For-Your-Home
A great read. I'll definitely be back.
https://diigo.com/0k2akk
carry on, dont stop
https://autobodyrepairraleigh.blogspot.com/2021/03/looking-for-best-auto-body-repair-shop.html
such a great information for blogger i am a professional blogger thanks
https://www.behance.net/gallery/115710583/Tips-for-Finding-a-Collision-Repair-Service
Usually I never comment on blogs but your article is so convincing that I never stop myself to say something about it. You're doing a great job Man,Keep it up.
https://www.scoop.it/topic/why-it-is-important-to-ensure-proper-collision-repair-estimates
I really like this post
https://signaturewindowwashing.wordpress.com/2021/03/17/commercial-window-cleaning-service-when-cleaning-the-windows-yourself-is-not-possible/
thanks for sharing!
http://www.northcarolinaheadlines.com/news/story/222780/signature-window-washing-company-celebrates-6-years-in-business.html
I really like this post
http://google.co.ug/url?q=https://goo.gl/maps/hwAqB4KE4ybHPmDK9
I'm not sure where you are getting your information, but great topic.
http://google.com.sl/url?q=https://goo.gl/maps/hwAqB4KE4ybHPmDK9
thanks for sharing!
http://google.com.my/url?q=https://posts.gle/FaTsydGwPrG8sewb9
A great read. I'll definitely be back.
https://google.com.ag/url?q=https://posts.gle/FaTsydGwPrG8sewb9
purchase vardenafil online https://vegavardenafil.com/ buy vardenafil over the counter with no pres. online
sildenafil 50 price https://eunicesildenafilcitrate.com/ sildenafil citrate tablets ip 100 mg
tadalafil 30 mg https://elitadalafill.com/ tadalafil dosage
alprostadil cream on ebay https://alprostadildrugs.com/ alprostadil gel online
such a great information for blogger i am a professional blogger thanks
https://www.christinis.com/
thanks for sharing!
http://italianrestaurantorlando.blogofoto.com/29952728/italian-restaurants-perfect-for-sunday-meals
A great read. I'll definitely be back.
http://italianrestaurantorlando.jiliblog.com/57564771/myths-about-italian-restaurants
thanks for sharing!
http://italianrestaurantorlando.diowebhost.com/53585008/five-must-try-dishes-at-your-local-italian-restaurant
Keep this going please, great job!
http://italianrestaurantorlando.amoblog.com/how-to-pick-italian-restaurants-21081910
thanks for sharing!
http://italianrestaurantorlando.arwebo.com/22867494/a-guide-to-extraordinary-italian-restaurants
Fairly high-quality explanation. continue the good work
http://italianrestaurantorlando.blog2learn.com/46382743/healthy-eating-options-available-at-italian-restaurants
Thank you, I've just been looking for information approximately this topic for a long time and yours is the greatest I have discovered so far. But, what in regards to the conclusion? Are you certain concerning the supply?
http://italianrestaurantorlando.blogzag.com/43803718/italian-restaurant-good-service-matters
very interesting , good job and thanks for sharing such a good blog.
http://italianrestaurantorlando.look4blog.com/38646803/italian-restaurants-a-wide-variety-to-choose-from
best i have ever seen!Hello, always i used to check webpage posts here early in the daylight, for the reason that i love to gain knowledge of more and more.
http://italianrestaurantorlando.mpeblog.com/23121470/what-italian-restaurants-have-to-offer-that-others-do-not
I'm not sure where you are getting your information, but great topic.
http://italianrestaurantorlando.blogdigy.com/the-local-italian-restaurant-has-much-more-to-offer-13456315
Wow this blog is very nice!
http://italianrestaurantorlando.link4blogs.com/22760543/how-to-find-the-best-italian-food-restaurants
This is a very interesting article. Please, share more like this!
https://www.2findlocal.com/b/13263720/signature-window-washing-denver-co
Thanks for wonderful information I used to be in search of this info for my mission.
http://goldencirclewebdesign.com/content-marketing-in-sam-ramon-ca/
Great article. Couldn't be write much better! Keep it up!
https://www.bing.com/maps?ss=ypid.YN873x16166619447012457553
Thank you, I've just been looking for information approximately this topic for a long time and yours is the greatest I have discovered so far. But, what in regards to the conclusion? Are you certain concerning the supply?
https://www.chamberofcommerce.com/united-states/colorado/denver/abrasive-products-manufacturers/2011452241-signature-window-washing
Thanks for wonderful information I used to be in search of this info for my mission.
https://www.elocal.com/profile/signature-window-washing-20438183
such a great information for blogger i am a professional blogger thanks
https://ezlocal.com/co/denver/window-cleaning-service/0916246364
Thanks for wonderful information I used to be in search of this info for my mission.
https://ezlocal.com/co/denver/window-cleaning-service/0916246364