frequency of crossovers at meiosis
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frequency of crossovers at meiosis         


Author: pslant
Date: Feb 19, 2008 11:19

I read that mendels second law (saying that traits are inherited
independently) if either

1) the genes regultating the traits reside on different chromosones
2) the genes are far from each other on the same chromosone

Can this really be true for 2) ?
If even nr of crossovers (including 0) is as common as odd, the traits
are more likely to follow each other than if the genes are at separate
chromosones.

Am I thinking about this wrong ?
6 Comments
Re: frequency of crossovers at meiosis         


Author: r norman
Date: Feb 22, 2008 10:49

On Tue, 19 Feb 2008 14:19:50 -0500 (EST), pslant@yahoo.com wrote:
>I read that mendels second law (saying that traits are inherited
>independently) if either
>
>1) the genes regultating the traits reside on different chromosones
>2) the genes are far from each other on the same chromosone
>
>Can this really be true for 2) ?
>If even nr of crossovers (including 0) is as common as odd, the traits
>are more likely to follow each other than if the genes are at separate
>chromosones.
>

Yes it is true.
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Re: frequency of crossovers at meiosis         


Author: Ron O
Date: Feb 22, 2008 10:49

On Feb 19, 1:19
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Re: frequency of crossovers at meiosis         


Author: Lorentz
Date: Feb 22, 2008 10:49

On Feb 19, 2:19 pm, psl...@yahoo.com wrote:
> I read that mendels second law (saying that traits are inherited
> independently) if either
>
> 1) the genes regultating the traits reside on different chromosones
> 2) the genes are far from each other on the same chromosone
>
> Can this really be true for 2) ?
> If even nr of crossovers (including 0) is as common as odd, the traits
> are more likely to follow each other than if the genes are at separate
> chromosones.
>
> Am I thinking about this wrong ?

Number 2 is true only if the total probability per generation of
cross over, for the entire chromosome including every gene on the
chromosome, is high. Maybe the article you are reading is assuming...
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Re: frequency of crossovers at meiosis         


Author: Tim Tyler
Date: Feb 22, 2008 10:49

pslant@yahoo.com wrote:
> I read that mendels second law (saying that traits are inherited
> independently) if either
>
> 1) the genes regultating the traits reside on different chromosones
> 2) the genes are far from each other on the same chromosone
>
> Can this really be true for 2) ?
> If even nr of crossovers (including 0) is as common as odd, the traits
> are more likely to follow each other than if the genes are at separate
> chromosones.

What - because small even numbers are more common than
small odd numbers?

"Far" is intended to mean that you don't need to bother much
about that.
--
__________
|im |yler http://timtyler.org/ tim@tt1lock.org Remove lock to reply.
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Re: frequency of crossovers at meiosis         


Author: Perplexed in Peoria
Date: Feb 22, 2008 10:49

yahoo.com> wrote in message news:fpfa4m$2e5n$1@darwin.ediacara.org...
>I read that mendels second law (saying that traits are inherited
> independently) if either
>
> 1) the genes regultating the traits reside on different chromosones
> 2) the genes are far from each other on the same chromosone
>
> Can this really be true for 2) ?
> If even nr of crossovers (including 0) is as common as odd, the traits
> are more likely to follow each other than if the genes are at separate
> chromosones.
>
> Am I thinking about this wrong ?

I can't tell. Genes on different chromosomes have a linkage (%% recombination)
of exactly 0.5. Pairs of genes on the same chromosome have a linkage
which approaches 0.5 asymptotically as the distance between the genes on the
chromosome increases.
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Re: frequency of crossovers at meiosis         


Author: dhoyt
Date: Feb 24, 2008 11:09

On Feb 19, 2:19 pm, psl...@yahoo.com wrote:
> I read that mendels second law (saying that traits are inherited
> independently) if either
>
> 1) the genes regultating the traits reside on different chromosones
> 2) the genes are far from each other on the same chromosone
>
> Can this really be true for 2) ?
> If even nr of crossovers (including 0) is as common as odd, the traits
> are more likely to follow each other than if the genes are at separate
> chromosones.
>
> Am I thinking about this wrong ?

Maybe this will help clear up your confusion.
Consider two loci (genes) that are on the same chromosome but far
enough apart so that there is ALWAYS at least a single crossover
between them. Since a crossover...
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