Re: Hardy-weinberg Equilibrium

rev.goetz wrote:

John Harshman wrote:

rev.goetz wrote:


John Wilkins wrote:


John Harshman wrote:


John Wilkins wrote:



rev.goetz wrote:



John Wilkins wrote:



R Brown wrote:



"Dhananjay" <mani.dhananjay@xxxxxxxxx> wrote in message
news:1140053878.611011.133970@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx



Why is it difficult to have a population in Hardy-weinberg Equilibrium?


For a population to be in Hardy-Weinberg equilibrium, it must satisfy five
main conditions:
1. The population is very large.
2. The population is isolated; this is, there is no migration of
individuals or gametes into or out of the population.
3. Mutations (changes in genes) do not alter the gene pool.
4. Mating is random.
5. All individuals are equal in reproductive success; that is, natural
selection does not occur.
Pretty tough to pull off.


Don't you also need to have mating being equiprobable between any two
organisms in the population?

--
John S. Wilkins, Postdoctoral Research Fellow, Biohumanities Project
University of Queensland - Blog: evolvethought.blogspot.com
Servum tui ero, ipse vespera

Did you miss "4. Mating is random."?


Random <> equiprobable


That's what it was clearly intended to mean. Best just to use the
technical term: panmictic.


Well I don't think that panmixis and random mating are quite the same thing
(yes, that may be what R Brown intended it to mean), because strictly, a
random mating = nonassortative, while panmixis means equal probability of any
two organisms mating.

Think of it this way - non-assortative mating means you'll mate with equal
likelihood any nearby organism. Panmixic mating means you'll likely mate with
any organism in the deme, nearby or not. I might not have any qualms about
mating with the local gals based on their phenotypic variants such as skin
colour, but that doesn't mean I'm equally likely to mate with gals who are
more distant but still in the same gene pool.

--
John S. Wilkins, Postdoctoral Research Fellow, Biohumanities Project
University of Queensland - Blog: evolvethought.blogspot.com
Servum tui ero, ipse vespera


"Statistical randomness" means that everything has an equal
probability. Perhaps you read too much from Richard Dawkins.


Really? I wouldn't say so. I'd say you were right if we assumed a
uniform distribution. But suppose we assumed a normal distribution?
Results near the mean would be much more probable than results in either
tail. Are you claiming that statistical randomness requires a uniform
distribution?

I assume that statistical randomness requires a uniform distribution
because statistical randomness means that everything has the same
probability. And a normal distribution is probabalistic and nonrandom.
On the other hand, we can randomly pick any given value in a normal
distribution.

Could you explain the difference between "probabilistic" and "random"?
You can throw in "stochastic" if you like. When I took statistics,
nobody mentioned the term "statistical randomness", so perhaps you are
right. But a random variable can be associated with any distribution,
and I had always supposed that random variables displayed randomness. Is
statistical randomness different from randomness?

.

Relevant Pages

  • Re: Hardy-weinberg Equilibrium
    ... Mating is random. ... while panmixis means equal probability of any ... But suppose we assumed a normal distribution? ... Are you claiming that statistical randomness requires a uniform ...
    (talk.origins)
  • Re: Hardy-weinberg Equilibrium
    ... Mating is random. ... while panmixis means equal probability of any ... But suppose we assumed a normal distribution? ... Are you claiming that statistical randomness requires a uniform ...
    (talk.origins)
  • Re: Hardy-weinberg Equilibrium
    ... Mating is random. ... while panmixis means equal probability of any ... But suppose we assumed a normal distribution? ... Are you claiming that statistical randomness requires a uniform ...
    (talk.origins)
  • Re: Hardy-weinberg Equilibrium
    ... Mating is random. ... while panmixis means equal probability of any ... But suppose we assumed a normal distribution? ... Are you claiming that statistical randomness requires a uniform ...
    (talk.origins)
  • Re: Hardy-weinberg Equilibrium
    ... Mating is random. ... while panmixis means equal probability of any ... But suppose we assumed a normal distribution? ... Are you claiming that statistical randomness requires a uniform ...
    (talk.origins)