Re: frequency of crossovers at meiosis
- From: r norman <r_s_norman@xxxxxxxxxxxx>
- Date: Fri, 22 Feb 2008 13:49:16 -0500 (EST)
On Tue, 19 Feb 2008 14:19:50 -0500 (EST), pslant@xxxxxxxxx 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.
The frequency of crossover is high enough so that, for all practical
purposes, traits far apart are essentially unlinked. Distance between
genes is measured in centimorgans, where 1 cM represents a 1%
frequency of crossover. Chromosomes are several hundred centimorgans
in length. Of course, at large distances, multiple crossovers are
likely. When distances are rather large, the probability of an even
number of crossovers is very close to the probability of an odd number
so that the genes are essentially unlinked.
.
- References:
- frequency of crossovers at meiosis
- From: pslant
- frequency of crossovers at meiosis
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