Genetics of colour in Newfoundlands
The genes found in black Newfoundlands
Black dog, whose
offsprings are all black. The colour of the mated dog does not have any
effect on the phenotype of the puppies. T-set can be tt, TT or Tt, as the
spotting or lack of spotting cannot be seen on the dog.
As with the previous
case, the dog is completely black, but depending if the gene marked with the
line is A/a, B/b, D/d, S/s, the dog can pass on recessive genes. Most dogs
have this gene combination. The different possibilities are further
explained in parts 3-6.
Black dog, but who
has the brown allele and can produce brown offsprings with a partner who has
Bb (phenotypically black) or bb (phen. brown). Normal.
Black dog, who
carries the black and tan-colour. Can produce black and tan coloured
offsprings with Aat-dog. Rare.
Black dog, who has
the dilution gene which produces grey and beige colour. Can produce grey and
beige offprings with a dog who has Dd or dd. Rare.
6) A-B-D-SspT- (or tt)
Black dog who carries
the allele for the landseer-colouring. If the mated partner is
landseer-coloured or also carries the allele for the colour, the offsprings
can have landseer colours. You can see the spotting on landseer-coloured
dogs, so the T-set affects the degree of spotting seen on the dog.
The genes found in brown
whose offsprings are all one coloured. If
the mated partner is black and white or black, the offsprings can be black.
If the partner also has the b-allele, the offprings can also be brown. Two
browns with no dilution genes, will always have brown puppies.
Brown dog, whose
offsprings cannot be black and white, but if the mated partner has the
At-allele, the offprings can be a.) brown and tan-coloured (if the partner
has At-allele and b-allele) or b.) black and tan-coloured (if the partner
has At-allele and B-allele). Extremely rare.
Very rare brown dog,
whose offsprings can be beige (also known as isabella), if the mated partner
has at least one b-allele and one d-allele.
4)A-bbD-Ssptt (or TT)
Brown dog, whose
offsprings can be brown and white, if the mated partner is landseer coloured
and has Bb-genes or if the partner is a black dog who carries Bb and
Ssp-genes or a brown dog who has bb and Ssp-genes. The spotting depends on
The genes found in black
and white Newfoundlands
white dog who does not have any spotting. If
the mated partner has one sp allele, part of the offsprings will be black
and white, part black. Two black and whites are always black and white. No
offspring can be brown, grey or brown/black and white. Dogs who have tt-sets
have no spotting. Dogs mated to TT-dogs always have spotting, and dogs mated
to Tt-partner will have some offsprings who have spotting, some who don’t.
Black and white dog who
does not have any spotting. The offsprings can be brown and white, if the
mated partner has sp and b-alleles. The spotting depends on the mated
partner in the same way as in the previous case. If the partner is B-S, the
offsprings can be black dogs in the same way as in the previous case. Not
white Newfoundland who has spotting. If
the mated partner is AatSsp, the offsprings can be tricolour: white with
black and tan-markings and spotting. Rare.
white dog with spotting. The
offsprings can be grey, if the mated partner has SS and d-alleles. If the
partner has sp and d-alleles, the offsprings can be white and grey. Rare.