Double rex is 2 doses of the dominate rexing genes (re, cu-1, or Cu-2) A double rex will exhibit very limited hair/fuzz or sparse hair particularly on the head, the hind end, and the legs. At times it will somewhat come and go. Patchwork Hairless is also a double dose of the rexing genes. They will have patches of short fuzz that can come and go and often appear over different parts of the rat’s body.
The Genes that give us Genetic Alopecia
True Type Hairless
The gene Hr - Hair locus (recessive)
Hr/Hr = standard coat
Hr/hr = hairless carrier
hr/hr = Hairless
The gene shn - Nude Locus (recessive)
Shn/Shn = standard coat
Shn/shn = shorn carrier
shn/shn = shorn hairless
Fz/Fz = standard coat
Fz/fz = fuzzy carrier
fz/fz = fuzzy hairless
The gene Rnu- recessive
Rnu/Rnu = standard coat
Rnu/rnu = rowlette nude carrier
rnu/rnu = rowlette nude hairless
The gene Fr- recessive
Fr/Fr = standard coat
Fr/fr = frizzy carrier
fr/fr = frizzy hairless
The Charles River “Hairless” Rat mutation maps to Chromosome 1: Allelic with Fuzzy and a likely Orthologue of mouse Frizzy, K Ahearn et al, The Journal of Heredity, (2002), 93 (3) pp 210-213
Maplewood genetics tutorial
http://www.geocities.com/Petsburgh/7989/rats/genetics.html
Rattie Rascals genetics Basics
http://www.boardmanweb.com/rattery/geneticbasics.htm
Genetic Resource courtesy of Bellaratta’s Nest Rattery
Posted on June 29, 2003, 13:11,
Last updated on May 5, 2006, 17:40
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