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Date: Tue, 26 Nov 96 09:14 EST
To: angenmapiastate.edu
From: "Jerry.Dodgson" <22314JBDMSU.EDU>
Subject: number of avian genes
As the basis for my comments I was considering only the expressed genes (Type
I markers) on the map. There now exist over 100 of these on the East Lansing
map. Since only chromosomes 1-5, 7, 8, Z, W, and 16 have been matched with a
linkage group to date, it is impossible to tell if the smaller linkage groups
are indeed microchromosomes or unlinked portions of macrochromosomes (even the
definition of what is and isn't a microchromosome is somewhat arbitrary).
However, the number of linkage groups is beginning to converge close to the
expected 38 plus Z and W, so most of the linkage groups are probably on
separate chromosomes. While a statistical analysis is not yet feasible, I
still see no evidence for clustering of the 100 or so expressed genes known on
small linkage groups that potentially could turn out to be microchromosomes,
nor is there any evidence for a relatively sparse distribution of expressed
genes on the macrochromosomes. Furthermore, with the exception of
minisatellites, anonymous markers appear to be relatively randomly distributed
with respect to the expressed gene markers, which would not be the case if
expressed genes heavily clustered to microchromosomes while microsatellites
were evenly distributed across the genome.
Jerry Dodgson
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