Understanding through Discussion

Welcome! You are not logged in. [ Login ]
EvC Forum active members: 65 (9077 total)
83 online now:
(83 visitors)
Newest Member: Contrarian
Post Volume: Total: 894,071 Year: 5,183/6,534 Month: 26/577 Week: 14/80 Day: 1/13 Hour: 0/0

Thread  Details

Email This Thread
Newer Topic | Older Topic
Author Topic:   Question About Evolutionary Rates
Dr Adequate
Member (Idle past 328 days)
Posts: 16112
Joined: 07-20-2006

Message 1 of 4 (409042)
07-06-2007 11:01 PM

Hi. One for the biologists, if they can help me out.

Suppose we have a set of selection pressures on a lineage, each of which would favor a novel mutation, and which do not interfere with one another: i.e. if selection pressure A favors mutation A, and selection pressure B favors mutation B, then the two selection pressures acting simultaneously will favor mutations A and B; and such that for all A and B the selective advantage of mutation A, when selection pressure A is operating, is the same whether or not selection pressure B is operating. We might call such pressures "orthogonal".

Suppose we do two experiments:

(1) We apply these selection pressures one at a time, and wait for each mutation to arise and be fixed before introducing a new pressure. So we apply selection pressure A, wait for mutation A to arise and be fixed in the gene pool, then apply pressures A and B, wait for mutation B to arise and be fixed in the gene pool, then apply pressures A, B and C ... and so forth until all the mutations have arisen and are fixed.

(2) Apply all the pressures simultaneously and wait until all the mutations have arisen and are fixed.

Suppose further that we can do this in such a way that the population is constant and the same in both experiments.

Which should go quicker?

I say that the second experiment should finish more quickly: this follows from probability theory and is borne out by computer simulations.

What I do not know is whether anyone has ever tried this out in real life. If anyone can help, I should be most grateful.

Edited by Dr Adequate, : No reason given.

Replies to this message:
 Message 2 by Adminnemooseus, posted 07-06-2007 11:21 PM Dr Adequate has replied

Posts: 3959
Joined: 09-26-2002

Message 2 of 4 (409044)
07-06-2007 11:21 PM
Reply to: Message 1 by Dr Adequate
07-06-2007 11:01 PM

Start with, how about a better topic title?
Something more tailored to the content of message 1.

That said, I'm passing this one to one of out bioadmins.


New Members should start HERE to get an understanding of what makes great posts.

Comments on moderation procedures (or wish to respond to admin messages)? - Go to:
General discussion of moderation procedures
Thread Reopen Requests
Considerations of topic promotions from the "Proposed New Topics" forum

Other useful links:

Forum Guidelines, Style Guides for EvC, Assistance w/ Forum Formatting, Proposed New (Great Debate) Topics, Official Invitations to Online Chat@EvC

Admin writes:

It really helps moderators figure out if a topic is disintegrating because of general misbehavior versus someone in particular if the originally non-misbehaving members kept it that way. When everyone is prickly and argumentative and off-topic and personal then it's just too difficult to tell. We have neither infinite time to untie the Gordian knot, nor the wisdom of Solomon.

There used to be a comedian who presented his ideas for a better world, and one of them was to arm everyone on the highway with little rubber dart guns. Every time you see a driver doing something stupid, you fire a little dart at his car. When a state trooper sees someone driving down the highway with a bunch of darts all over his car he pulls him over for being an idiot.

Please make it easy to tell you apart from the idiots. Source

This message is a reply to:
 Message 1 by Dr Adequate, posted 07-06-2007 11:01 PM Dr Adequate has replied

Replies to this message:
 Message 3 by Dr Adequate, posted 07-07-2007 12:01 AM Adminnemooseus has taken no action

Dr Adequate
Member (Idle past 328 days)
Posts: 16112
Joined: 07-20-2006

Message 3 of 4 (409050)
07-07-2007 12:01 AM
Reply to: Message 2 by Adminnemooseus
07-06-2007 11:21 PM

Re: Start with, how about a better topic title?
It's kind of a difficult question to summarize, I'm afraid. Have you any suggestions?

This message is a reply to:
 Message 2 by Adminnemooseus, posted 07-06-2007 11:21 PM Adminnemooseus has taken no action

Posts: 12808
From: EvC Forum
Joined: 06-14-2002
Member Rating: 2.2

Message 4 of 4 (410312)
07-14-2007 9:39 AM

Thread moved here from the Proposed New Topics forum.

Newer Topic | Older Topic
Jump to:

Copyright 2001-2018 by EvC Forum, All Rights Reserved

™ Version 4.1
Innovative software from Qwixotic © 2022