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Author Topic:   Quick Questions, Short Answers - No Debate
nwr
Member
Posts: 5590
From: Geneva, Illinois
Joined: 08-08-2005


Message 16 of 585 (447359)
01-09-2008 1:01 AM


Transposable genes
Can genes transpose into and out of the junk DNA?


Let's end the political smears

Replies to this message:
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molbiogirl
Member (Idle past 1022 days)
Posts: 1909
From: MO
Joined: 06-06-2007


Message 17 of 585 (447360)
01-09-2008 1:09 AM
Reply to: Message 16 by nwr
01-09-2008 1:01 AM


Re: Transposable genes
Transposons are junk DNA. One and the same.

Transposons make up about 1/3 of our non-coding DNA.


This message is a reply to:
 Message 16 by nwr, posted 01-09-2008 1:01 AM nwr has responded

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nwr
Member
Posts: 5590
From: Geneva, Illinois
Joined: 08-08-2005


Message 18 of 585 (447365)
01-09-2008 1:45 AM
Reply to: Message 17 by molbiogirl
01-09-2008 1:09 AM


Re: Transposable genes
Very interesting. Thank you.

McClintock discovered transposable genes because of their affects on the appearance of corn. If they are non-coding, they should not have that effect. So I think that indicates that they can move out of the junk DNA. Comments?


Let's end the political smears

This message is a reply to:
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Replies to this message:
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molbiogirl
Member (Idle past 1022 days)
Posts: 1909
From: MO
Joined: 06-06-2007


Message 19 of 585 (447371)
01-09-2008 2:04 AM
Reply to: Message 18 by nwr
01-09-2008 1:45 AM


Re: Transposable genes
Transposons are supposed to jump in and out of DNA. And usually everything goes OK.

Sometimes they get left behind in the host genome because the transposon loses a chunk of something important (and it can't move anymore).

McClintock's maize transposons suppressed a color gene (I don't know how -- probably because it was sitting in the gene). If the transposon jumped, the gene suppression disappeared and the maize started making pigment.

So, technically, those transposons weren't junk DNA (cause they still worked).

Edited by molbiogirl, : No reason given.


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sinequanon
Member (Idle past 1245 days)
Posts: 331
Joined: 12-17-2007


Message 20 of 585 (447409)
01-09-2008 7:46 AM


Runners and hoppers
I've long wondered why some birds run/walk and others hop. It doesn't seem to correlate with their feeding habits or habitat in an obvious way. For example, some ground feeders like robins and blackbirds hop, while wagtails and pigeons tend to run or walk. Even starlings walk on the ground, even though they spend a lot of time in trees where they would have to hop. Crows do both more regularly then other birds I have seen.

Any ideas?


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nwr
Member
Posts: 5590
From: Geneva, Illinois
Joined: 08-08-2005


Message 21 of 585 (447411)
01-09-2008 7:55 AM
Reply to: Message 19 by molbiogirl
01-09-2008 2:04 AM


Re: Transposable genes
That's fascinating. Thanks.


Let's end the political smears

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molbiogirl
Member (Idle past 1022 days)
Posts: 1909
From: MO
Joined: 06-06-2007


Message 22 of 585 (449123)
01-16-2008 6:43 PM


Search function?
Is there something wrong with the search feature?

I recently searched a thread for "Brookings" and found only two results. I knew there were others and went thru the thread post by post -- and sure enough, there they were.

This isn't the first time this has happened.

Am I doing something wrong? Is the search function hinky?


Replies to this message:
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 Message 25 by RAZD, posted 01-16-2008 9:03 PM molbiogirl has responded

  
jar
Member
Posts: 31996
From: Texas!!
Joined: 04-20-2004
Member Rating: 2.2


Message 23 of 585 (449125)
01-16-2008 6:51 PM
Reply to: Message 22 by molbiogirl
01-16-2008 6:43 PM


Re: Search function?
It sucketh.


Anyone so limited that they can only spell a word one way is severely handicapped!

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nwr
Member
Posts: 5590
From: Geneva, Illinois
Joined: 08-08-2005


Message 24 of 585 (449126)
01-16-2008 6:53 PM
Reply to: Message 22 by molbiogirl
01-16-2008 6:43 PM


Re: Search function?
I'm not certain, but I think the comments in this earlier post still apply


Let's end the political smears

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RAZD
Member
Posts: 20459
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 3.6


Message 25 of 585 (449149)
01-16-2008 9:03 PM
Reply to: Message 22 by molbiogirl
01-16-2008 6:43 PM


Re: Search function?
Try google with
site:http:// Brookings

You may need to pick the Similar Pages link.

Enjoy.

(cutie ;))

I feel pretty
oh so pretty
it's a pity how pretty I feeeeeeeeeeeeel ...


Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click)

we are limited in our ability to understand
by our ability to understand
RebelAAmericanOZen[Deist
... to learn ... to think ... to live ... to laugh ...
to share.

This message is a reply to:
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Replies to this message:
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molbiogirl
Member (Idle past 1022 days)
Posts: 1909
From: MO
Joined: 06-06-2007


Message 26 of 585 (449176)
01-16-2008 11:41 PM
Reply to: Message 25 by RAZD
01-16-2008 9:03 PM


Re: Search function?
Thanks, RAZD!

I feel pretty
oh so pretty
it's a pity how pretty I feeeeeeeeeeeeel ...

Naughty kitten.

Hey. That book I posted (it lives in The Book Nook now) has some great abiogenesis stuff. Especially Robert Shapiro's part.


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arachnophilia
Member (Idle past 358 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004


Message 27 of 585 (449194)
01-17-2008 2:54 AM
Reply to: Message 25 by RAZD
01-16-2008 9:03 PM


Re: Search function?
Try google with
site:http:// Brookings

You may need to pick the Similar Pages link.

i almost think we should abandon the search script entirely, and just have that top link go to google. i've seen pages that have a "search within webpage" and "search the web" option, via google. iirc, talk.origins uses something similar. that would work way better here.

i think it's pretty much what everyone uses anyways. the built-in search feature verily doth suketh. it does some really wacky things, and takes forever to do them.


אָרַח

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BMG
Member (Idle past 2543 days)
Posts: 356
From: Southwestern U.S.
Joined: 03-16-2006


Message 28 of 585 (449201)
01-17-2008 4:57 AM


Generally speaking
Quick question to the experienced; is it possible (or wise) to attempt to go to school for a degree in the sciences while working full-time?

Of those I have asked and replied, "it was possible" , most claimed that the time required for class (and labs, especially) while working full-time is strained, and manifests itself as a great stressor to students. Is this true?

Any feedback from those with science degrees is much appreciated.


Replies to this message:
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nwr
Member
Posts: 5590
From: Geneva, Illinois
Joined: 08-08-2005


Message 29 of 585 (449222)
01-17-2008 7:47 AM
Reply to: Message 28 by BMG
01-17-2008 4:57 AM


Re: Generally speaking
It depends on what science, what are your goals, how tiring is your work, etc.

I suggest you open a Coffee House thread with a bit more info on what you are your aims.


Let's end the political smears

This message is a reply to:
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Replies to this message:
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Stile
Member
Posts: 3873
From: Ontario, Canada
Joined: 12-02-2004
Member Rating: 2.3


Message 30 of 585 (449240)
01-17-2008 9:23 AM
Reply to: Message 20 by sinequanon
01-09-2008 7:46 AM


Re: Runners and hoppers
sinequanon writes:

I've long wondered why some birds run/walk and others hop. It doesn't seem to correlate with their feeding habits or habitat in an obvious way.

To me, it correlates with bird physical-size-and-ability and their environment.

Taking the following into consideration:

-hopping is faster than running
-hopping takes more energy than running
-as bird size increases, the energy needed to hop also increases
-hopping can be necessary to get over rough terrain
-what's "rough" depends on the bird's physical characteristics

And it becomes clearer that smaller birds will hop more often as most terrain is "rough" to them, and it doesn't take that much more of an energy increase. While larger birds are more capable of stepping over most obstacles, and hopping becomes a less efficient use of energy.

We still see small birds walking/running on flatter terrain when they're not in any hurry. Or large birds hopping when terrain gets rough for them, or when panic sets in.

Seems to me it's more of a efficiency decision by each specific bird in each specific situation depending on energy conservation, environmental terrain and speed considerations.


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