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Author Topic:   What mutations are needed for a particular trait (e.g. wings) to arise?
crashfrog
Member (Idle past 221 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 42 of 111 (345498)
08-31-2006 5:00 PM
Reply to: Message 39 by skepticfaith
08-31-2006 4:01 PM


Re: Summary ..
To get from a non-flying creature to a bird hypothetically - ( I could have chosen flying insects too but I am sure there are absoultely no fossils that could even suggest insect evolution)

Woah, what?

I'm married to an entomologist and believe me when I tell you, I don't know where you got that idea. There's a huge fossil record for insect evolution. They fossilize great because of their sclerized exoskeleton.

What on Earth leads you to "be sure" that insect fossils don't show a very clear pattern of insect development?


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crashfrog
Member (Idle past 221 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 49 of 111 (345516)
08-31-2006 6:48 PM
Reply to: Message 46 by skepticfaith
08-31-2006 5:50 PM


Re: Summary ..
care to show me a few links ?

Well, allow me to "link" you to the paleontology and entomology departments of your local major university. They'll almost certainly have a museum of fossils that you can view by arrangement.

Also, a Google Image search for "fossil insect" returned more than 2600 results.


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crashfrog
Member (Idle past 221 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 52 of 111 (345526)
08-31-2006 7:44 PM
Reply to: Message 50 by NosyNed
08-31-2006 7:04 PM


Re: insect rarity
Well, even my wife, who is smarter than me in every regard, has been known to be wrong. (This is not a position that I promote in her presence, of course.)

This message is a reply to:
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crashfrog
Member (Idle past 221 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 63 of 111 (346037)
09-02-2006 1:36 PM
Reply to: Message 60 by Hawks
09-02-2006 5:00 AM


It's time to play...
Beneficial, Neutral, or Harmful!

Suppose that a bacterium recieves a mutation that confers resistance to an antibiotic that is not present in the envrionment. Beneficial or neutral?

Suppose further that the mutation causes resistance by changing a gene product that allows the bacterium to metabolize lactose when glucose is not present. The protein no longer has that function but now promotes resistance against the antibiotic. Neither lactose nor the antibiotic are present in the environment, and glucose is present. Beneficial, neutral, or harmful?

The antibiotic is present, but lactose is not. Beneficial, neutral, or harmful?

Lactose is present, but the antibiotic is not. Beneficial, neutral, or harmful?

Both lactose and the antibiotic are present. Beneficial, neutral, or harmful?

A new antibiotic is introduced that specifically targets the mutation. Wild-type bacteria are not affected. Beneficial, neutral, or harmful?

Edited by crashfrog, : No reason given.


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crashfrog
Member (Idle past 221 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 68 of 111 (346211)
09-03-2006 10:49 AM
Reply to: Message 65 by Archer Opteryx
09-02-2006 11:48 PM


Re: It's time to play...
Well, they were largely rhetorical questions, but-

We have a winner! (Crashfrog, tell him what he's won!)

Um... a cookie?


This message is a reply to:
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