[Jacob-list] another "this can't happen" at ISeeSpots Farm

[Jacobflock at aol.com]

In a message dated 2/21/2005 3:49:22 PM Central Standard Time, 
buffgeese at yahoo.com writes:

> One is 2-horned and
> the other is 4-horned.  Both parents are TWO HORNED.  
> 
> 

If one can set aside Medelian complete doinance and the omnipresent 
"splitting gene", consider  incomplete penetrance, limited multiple alleles or 
pleitropy (split eyelids and multiple horns).  The results of F1 and f2 offspring seem 
to suggest one of the later mechanisms.  Perhaps the proof is replicating the 
work done on CH10, the sheep horn locus, comparing the chromosomes and 
messenger rna.  The question is 100 years old and someone may take it up as a master 
or doctoral project.

Fred Horak

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