Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Labradoodle Coat Colour Tutorial - The basics.

No description
by

Jenny Marshall

on 13 November 2016

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Labradoodle Coat Colour Tutorial - The basics.

Australian Laradoododle Coat Colour Genetics

Yellow
Labradoodle
phenotypes
in this colour group range in shades from chalk to red but all shades can have one of 3 genotypes.
This colour group is a little different by having either
black pigment
noses or
brown or rose pigment
noses - so we will divide them into two groups.
Yellow
Labradoodles with
Black
noses
These dogs have the genotype
or
Yellow
dogs (any shade from chalk to red) with
Brown
noses
this colour has the genotype
this phenotype we call caramel and depending on the shade of yellow might be called ice caramel, caramel cream or dark caramel.
BB
ee
Bb
ee
Black
Brown
Some terms we use when discussing coat colour genetics.
bb
ee
We call these colours or phenotypes chalk, cream, gold and red.
The colour
Pheonotype
this is what a dog looks like in regards to it's colour - what we see with our eyes.
it might be
Black
or
Chocolate
or
cream
with a
black
nose
These are the 4 basic colour phenotypes we see in Labradoodles - even the more unusual colour patterns such as sable, phantom and parti or dilutions such as sliver and cafe' have one of these colours as a base or primary colour phenotype.
This is a tutorial to explain basic Labradoodle coat colour genetics.
It's aim, is give you a basic understanding of Labradoodle colour genetics and to provide you the tools to be able predict and plan the possible colours that may result when planning litters.
It covers the 3 main Labradoodle colour groups -
yellow
,
chocolate
and
black
.

A separate tutorial will cover more complex genetic colour patterns in Labradoodles, such as sable, phantom, brindle and parti.
or
cream
with a
brown
nose.
Genotype
A dogs genotype is the DNA that makes up its coat colour and or pattern.
There are 3 basic DNA colour groups in the Labradoodle - Yellow, brown and black.
bbee
BBEE
BbEe
bbEe
The base colour genotype is made up of alleles. Some allele's are dominant and some are recessive. Recessive allele's are written in lower case, dominant allele's in upper case.
2 different sets of allele's control the 3 major colour groups.
DNA, Chromosomes and Alleles
A quick lesson in the biology of DNA.
A
DNA
strand is the carrier of genetic information.
DNA
Is made up of smaller units called
chromosomes
.
Chromosomes
hold the
genes
.
An
allele
is an alternative form of a gene (one member of a pair) that is located at a specific position called the
locus
on a chromosome.
Terms we will be using and will be useful to remember are
allele
and
locus.
E-locus
There are 3 different combinations of genes that can be found at the
E-locus
that control coat colour.
EE
Ee
and
ee
As
e
is the recessive allele for a dog to be in the yellow colour group it will need to have 2 recessive
ee
alleles.
Dogs that have the genes
EE
or
Ee
will either be
Black
or
Brown.
These are the
E-Locus
allele's and the
B-Locus
alleles.
B-Locus
The two alleles at this locus are the dominant full colour
B
and the recessive brown
b.
This gene is where the colours associated with brown come from.
The two alleles that make up this locus are the dominant black
E
and the recessive yellow
e.
As
E
is dominant over
e,
dogs that have the
E
gene will be
black
.
Now using this information we can put the E-locus and B locus together to see the full colour genotype of each dog.
Two copies of recessive brown
b
are needed to dilute black pigment to brown.
Full colour
B
is dominant over
b.
For yellow dogs, the brown allele does not dilute the hair color, but will change the colour of nose and foot pads from black to brown if two brown alleles (
bb
) are present.
The genotypes at the B-Locus are
BB
Bb
bb
Dogs with the genotype
bb
are brown, or yellow with brown nose.
or
The dominant
B
allele causes their nose pigment to be black. The double recessive
e
allele means that their coat colour will be yellow.
This colour is a double recessive the two recessive brown alleles give it a brown nose and the double recessive e alleles a yellow coat.
This is the one colour that we can tell its genotype by what we see or its phenotype. A caramel dog (yellow with a brown nose) will
always
have the genes
bbee
.
Black labradoodles range in shades from black to silver but like the different shades of yellow they have the same genotypes regardless of the darkness or lightness of the black colour.
A black labradoodle can have one of 4 different genotypes.
BBEE
BBEe
or
The yellow labradoodle with the genotype
BB
ee
, because of the two dominant alleles
BB
, means that it does not carry the recessive brown gene
b
. So this dog cannot produce brown (chocolate/cafe/parchement) puppies.
The yellow labradoodle with the genotype
Bb
ee
because of the recessive allele
b
carries the brown gene and if bred to a labradoodle that is brown or carries the brown gene will have puppies in the litter that are brown
A caramel labradoodle when bred to another colour will pull out any other base colours carried by the other dog.
Is a dominat colour.
The 4 Black Genotypes - what they mean.
BBEE
If you dog has this genotype they will only ever produce black puppies as it does not carry the recessive genes for yellow or brown.
BbEE
If you have a dog with this genotype it can only produce black or brown puppies as it does carry the recessive brown gene (b) but not the yellow gene.
BbEe
If you have a dog with this genotype it can produce black, yellow and brown pups as it has the recessive brown (b )allele and the recessive yellow allele (e).
Is a recessive colour
Brown labradoodles range in shades from dark chocolate to parchment but like the different shades of yellow they have the same primary genotypes regardless of the darkness or lightness of the brown colour. Brown labradoodles always have brown or liver/rose noses
There are 2 genotypes for brown labradoodles.
bbEE
or
bbEe
About the Brown genotypes....
bbEE
Dogs with this genotype do not carry the yellow gene so will not produce yellow pups. Any puppies will be black or brown.
bbEe
Dogs with this genotype carry the yellow recessive gene (e). Puppies from this dog can be yellow, brown or black.
BBee
Bbee
bbee
The three yellow genotypes are...
Putting it all togther
- a helpful tool!
When we know the sire and dam's colour DNA genotype we can use this table to predict the primary colours we can expect to get in a litter.
Things to remember - this is only a prediction of what colours and numbers you can expect if the gene's that each pup gets from its parents throw statistically perfectly. When you have a large litter you tend to get closer to the colours and numbers predicted. With small litters 3-4 pups you may not see all the predicted colours or in the suggested proportions.
So how do we know what genotype our Labradoodle is?
If you have a caramel dog then you know that the genotype is
bbee
- double recessive. Yellow coat,brown nose.
Using the phenotype.... (what we see)
For the colours black and chocolate if the dog has a chocolate or yellow parent then you know that the dog carries for those colours.
eg. If you have a chocolate puppy from a yellow father (with a black nose) and chocolate mother - there were chocolate, black and yellow pups in the litter.
Yellow father is
To produce a chocolate puppy the black nose yellow sire must carry the chocolate gene. So we know his genotype must be
Bbee
(the other genotype
BBee
-would only produce black and yellow pups from this mating).
Bbee
Chocolate mother as she had all three colours of pups in the litter must carry the yellow gene.
Chocolate mother is
bbEe
So

Bbee
x
bbEe
BbEe - black that carries yellow and choc
bbEe - chocolate that carries yellow
Bbee - Yellow with a black nose carries choc
bbee - Yellow with a brown nose
A chocolate pup from this mating must have the genotype bbEe -
Working out your dogs genotype using Orivet DNA profile.
All ALA dogs are getting colour DNA results from Orivet with required full breed profile.
So knowing what colour DNA your dog has is as easy as learning to interpret the results.
This is the what the genetic report from Orivet looks like.
We are only interested in looking at this area called 'TRAITS' when we are learning about our dogs coat colour genotype.
Lets look at these results in more detail.
So when we are determining the primary coat colour genotype of our dog we need to look at two results.
The B -locus
we can see from the results that this dog is bb which means it is is brown or chocolate. The red colour group we see in Labradoodles comes from the yellow gene not from the brown gene.
The E-Locus
This result shows that the dog is ee which means it in the yellow group.
From our Orivet results we see that this dogs genotype is
bb
ee
- yellow with a brown nose.

If you take your Orviet Colour results and work out you dogs DNA genotype you can then use the table provided to work out statistical colour outcomes for matings
Our next tutorial will cover the more unusual colour patterns of parti, sable and phantom.
BbEe
Note the small ee's
Note the small b's
( dog pictured is Red)
BbEE
BBEe
A dog with this genotype will only produce pups that are Black and Yellow as it does not carry the recessive brown gene (b).
Full transcript