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GENETICS GUIDE
Working with the White Mutation

By - Anjela Ross
Crystal Chinchillas
Co-Director of the Chinchilla Club

The white is indeed a useful mutation to work with, producing various new colours when blended with others. Such as with black velvet or brown velvet for example. Whites are always popular with people as pets, as it is not usual to find two that look identical. The reason for this is the tipping and spotting genes within a White. Sometimes a white can have both the tipping and the spotting gene.
If you have a white with the tipping gene, you are more likely to produce Silver type whites. Where the animal is white, but the very tips of the hair are grey, hence producing a silver appearance. When the spotting gene is present, dense patches of colour can be seen, dependant on the type of animal you have crossed you white to. This is usually known as a white mosaic. Some of the most dramatic patches, are when crossing a white to a black velvet. Then it is possible to produce Black and white crosses, where the animal is white, but with patches of black velvet, that are completely black mixed in with the white. Working with the White can indeed produce some pretty and unusual results. However, please note that the following guide is for coat colour only and that due to the White mutation having not so dense fur, that by continually placing Whites to mutations can lead to the animals lacking density and having fur that can appear woolly in appearance. So it is indeed wise to always put your white mutations back to Standards every other generation, to increase the density and keep the size in the animals.
The numbers given in each of the tables below
are the percentage chances of breeding those specific colours

Standard mated to White
Standard 50
White 50

Beige mated to White
Standard 25
Beige 25
White 25
Pink White 25

Black Velvet mated to White
Black/White cross 25
White 25
Black Velvet 25
Standard 25

Brown Velvet mated to White
Brown/White cross 12½
Pink White 12½
Black/White cross 12½
White 12½
Brown Velvet 12½
Beige 12½
Black Velvet 12½
Standard
12½

Pink White mated to White
Beige 12½
Standard 12½
Fatal 25
Pink White 25
White 25

Black / White Cross mated to White
Black Velvet 12½
Standard 12½
Fatal 25
Black/White cross 25
White 25

Brown / White Cross mated to White
Brown Velvet
Black Velvet
Beige
Standard
White 12½
Black/White cross 12½
Pink White 12½
Brown/White cross 12½
Fatal 25

Homozygous Beige mated to White
Pink White 50
Beige 50

Homozygous Beige / Black Cross mated to White
Beige 25
Brown Velvet 25
Pink White 25
Brown/White cross 25

Homozygous Beige / White Cross mated to White
Beige 25
Fatal 25
Pink White 50


What is meant by Fatal?

This will NOT mean you will have 25% of your babies born dead or deformed. It means that you would have expected a colour which is not possible because of a lethal gene.
There are two combinations that are not possible. These are :
  • Homozygous White.
  • Homozygous Black.
The fetus for these colours never develops. However, if the female had produced two eggs for fertilization, the other may be fertilized instead.




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