Re: ladder of dominance
iris@hort.net
  • Subject: Re: ladder of dominance
  • From: i*@aim.com
  • Date: Mon, 01 Mar 2010 09:11:24 -0500
Welcome to our discussion group. there is lots of information on genetics in
the archives.

Genetics of iris is organized a bit different then genetics of Rabbits.B B  I
would tend to call the Rabbit charts more breeding charts then genetic charts
as patterns and colours are mixed rather then organized by pigmentB  vs
pattern.

For example, albino (which is listed in C chart (patterns) is actually a
pigment gene and an allele of B gene. same as Vienna gene. Both of which are
blockages in chain of production of theB  colour pigments in animal hair
(redbyellow pheomelanin and blackbbrown eumelanin.)B 

There also is some linkages in gentics in rabbits. the pigment genes(B,B, c, v
) are closely linked with the pattern genes (cchd, cchl, chmi)B B  so there
isn't a clean mendilian seperation.

Some linkage in some iris geneticsB  as well.

The Rabbit charts do work for breeding, but are not organized by gene
grouping.

In iris weB  have two pigment classes, the water soluble anthocyanin
delphinidin, and the oil soluble cartenoids (usually lycopene and
beta-carotene), and the modifier genes that go with each.

Each set of pigment groups are delt with , with their own set of pattern
distribution.

There are some breeding charts that have been set up. they should be in
archives somewhere.

With tetraploids you can have three partially dominant alelles inherited
seperatly, with multiple patterns. More complicated then diploid inheritence.

For example, plicata genes. There are four alleles for plicata. Pl is the
dominant gene, and when present, the isn't any plicata pattern. Plicata is
basically the sitching/dotting of the anthocyanin pigment delphinidin(blue
pigment in pure form) around the edge of the flower. There are three subgoup
alleles. the glaciataB  pl-g (complete absence of pigment), classic pliactaB 
pl (stitching around edge) and luminata pl-lu ( we know this by its phenotype
of a wash of colour, but this is actually not its base homozygous effect).
They are all partially dominant genes so interact with each other. With
diploids we haveB  3 x 3 , or 9 genetic combinations of these three plicata
allels. with tetraploids we haveB  3x3x3x3, or 81 combinations. While some are
the same, it does give a wide variation on patterns.

Now all these patterns a can be combined withB  various ground colours, white,
yellow (many shades) or pink (lycopene colour), can be combined with several
other pattern distibution genes, to provide a huge number of plicata colours
and patterns.

So, a lot to learn. Starting with genetix in "World Of Iris" is a good place
to start.

Good luck.

Chuck Chapman


Date: Sun, 28 Feb 2010 20:11:36 -0600
From: Cindy Servis <iceboxrabbitry@hotmail.com>
Subject: RE: [iris] iris DIGEST V1 #1023

Hello,

The ladder of dominance for rabbits is as follows.



The capitalized letters are the dominant ones...the dominant ones are
always at the top...and the genes that are recessive to the dominant
ones are below it...hence it being named the "ladder of dominance".
Each series is separate.  The A series has no control over the B
series...but some of them can affect the way that the others look.  For
example, the e series "e" will turn a black agouti to a red by removing
the black pigment.  It also removes a lot of the black pigment from a
self black...making the rabbit have "points" similar to a fawn boxer
dog.  This is called tortoiseshell (abbreviated "torte" in many rabbit
circles)...but doesn't look at all like a tortoiseshell cat.



A-Agouti (dominant wild color)

at-tan (recessive to agouti but dominant over self)

a-self (recessive to both agouti and tan)



B-black

b-chocolate



C-full color

cchd-chin dark

cchl- chin light

ch-himi

c-red eyed white



D-non dilute

d-dilute



Es-steel

E-full extension

ej-japanese (harlequin)

e-non extension (tortoiseshell)



En-broken

en-solid



V-vienna

v-non vienna



W-wideband (controls the amount of pigment on the center band of pigment in
agoutis.)

w-normal bands



There's also a Dutch Gene and I don't know much about it because I don't have
it in my herd, but believe it is as follows.



Du-dutch

du-non dutch.



I do know that horses and dogs and cats aren't quite the same.  I do know that
wolves and coyotes are Agoutis tho.  Agouti causes the "ring" pattern seen
when you blow into the fur.  Selfs will appear a solid color almost all the
way to the center of the coat (where it will fade gently to white) of an
animal.



The genetics of MOST wild rabbits are mostly dominant genes...they look like
this.



AA BB CC DD EE enen dudu ww  Notice that all are dual (2 genes=diploid)
pairings...and with irises being tetraploids (4 genes) they would look
more like this.

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index