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Chinchilla Genetics - Punnet Squares

 

Standard layout of a Punnet Square.Punnet Squares - Is a diagram that is used to predict an outcome of a particular cross or breeding experiment. The genes of one parent are shown along the top and the genes of the other shown down the left-hand side. The 4 meeting squares is a summary of every possible outcome for that particular combination.

It should be noted that punnet squares can provide more than 4 different outcomes depending on the genetic make up of the maternal and paternal alleles.

We shall use Punnet Squares to illustrate some of the various combinations, which make up the base colours:

Standard Grey - Chin 1 - Standard Grey (aa) + Chin 2 - Standard Grey (aa)

unnet square showing the results when breeding two Standard Grey chinchillas together.Chinchilla Genetics - Standard Grey male chinchilla.  Danica Jackson.100% of the offspring of this combination will be Standard Grey with Homozygous Recessive genes (aa).

 

 

 

White - Chin 1 - Standard Grey (aa) + Chin 2 - White (Aa)

unnet square showing the results when breeding a Standard Grey and White chinchilla together.Chinchilla Genetics - White Mosaic male chinchilla.  chinchillas.com50% of this chinchilla colour combination would result in Standard Grey offspring and 50% will be White - either Mosaic, Silver or Wilson White.

 

 

 

White - Chin 1 - White (Aa) + Chin 2 - White (Aa)

his Punnet Square shows the results when breeding two Homozygous White chinchills together.Caution - two White chinchillas cannot form in the Homozogyous state.Two white chinchillas that are bred together carry a fatality gene as a White chinchilla cannot exist in the Homozygous (AA) state. This punnet square confirms this with 25% of the offspring carrying the fatality gene, which will be reabsorbed, 25% would be Standard Grey in colour and the remaining 50% would be Heterozygous White like their parents.

 

Heterozygous Beige - Chin 1 - Heterozygous Beige (Aa) + Chin 2 - Standard Grey (aa)

Punnet Square showing the results of breeding a Standard Grey chinchilla to a Heterozygous Beige chinchilla.Chinchilla Genetics - Heterozygous male chinchilla.  Chinchilla Chronicles.Breeding a Heterozygous Beige and a Standard Grey chinchilla together will result in 50% offspring as Heterozygous Beige and 50% Standard Grey.

 

 

 

Homozygous Beige - Chin 1 - Homozygous Beige (AA) + Chin 2 - Heterozygous Beige (Aa)

Punnet Square showing the results of breeding a Heterozygous with a Homozygous Beige chinchilla together.Chinchilla Genetics - Homozygous Beige male chinchilla.  chinchillas.comCombining two Beige chinchillas together - one in the Homozygous state and the other in the Heterozygous form, produces 50% Homozygous Beige and 50% Heterozygous Beige offspring.

* 100% Homozygous Beige offspring is produced if both parents are Homozygous Beige themselves.

 

Violet - Chin 1 - Violet Carrier (Aa) + Chin 2 - Violet Carrier (Aa)

Punnet Square showing the results of breeding two Violet Carriers together.Chinchilla Genetics - Violet male chinchilla.  Kelly Lynn Smith.As Violet is a recessive colour mutation it will only be exposed in the fur if bred with another Violet chinchilla either in the Homozygous state (AA) or as another 'carrier' (Aa). This combination of two Violet carriers produces 25% Pure Violet (AA), 25% Standard Grey and 50% Standard Grey - Violet Carriers (Aa).

 

Violet (example 2) - Chin 1 - Violet Carrier (Aa) + Chin 2 - Homozygous Violet (AA)

Punnet Square showing the results of breeding a Violet Carrier with a Homozygous Violet chinchilla.Chinchilla Genetics - Violet (Ebony Carrier) female chinchilla.  chinchillas.comCombining a Violet 'carrier' with a pure Homozygous Violet produces 50% Violet offspring and 50% Standard Grey - Violet Carriers.

* 100% Violet offspring is produced if both parents are Violet in the Homozygous form.

 

Sapphire - Chin 1 - Homozygous Sapphire (AA) + Chin 2 - Homozygous Sapphire (AA)

Punnet Square showing the results when breeding two Homozygous Sapphire chinchillas together.Chinchilla Genetics - Sapphire male chinchilla.  chinchillas.comSapphire is another recessive colour mutation and if you wanted to be guaranteed to produce offspring of a recessive colour mutation in the first generation you are best to breed two Homozygous chins together. In this example, we bred two Homozygous Sapphires together and produced 100% Homozygous Sapphire offspring. All of these chinchillas would express this recessive colour mutation within their fur.

Charcoal - Chin 1 - Heterozygous Charcoal (Aa) + Chin 2 Heterozygous Charcoal (Aa)

Punnet Square showing the results when breeding two Heterozygous Charcoal chinchillas together.Chinchilla Genetics - Charcoal Male.  Kelly Lynn Smith.A combination of two Charcoal carriers will produce 25% Homozygous Charcoal (AA), 25% Standard Grey and 50% Standard Grey - Charcoal Carriers.

 

More...

 
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Chinchilla Chronicles - Home to Chinchilla Care and Education.
   
Chinchilla Facts ...

Reginald C.Punnet, was
one of the first English
geneticists, who devised
the approach - which
is now known as Punnet
Squares.

This diagram helped to
determine the probability
of possible genotypes
in a particular offspring.

It is important to note that
Punnett Squares give
probabilities only for
genotypes and not
phenotypes.

   
Book Reviews ...
   

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chinchillas.”

“An ideal book
for any Chinchilla
owner, 'An Essential
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need for a relationship
based on understanding
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coming fully illustrated
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Chinchilla Chronicles - Home to Chinchilla Care and Education.
Chinchilla Group - Heterozygous Beige, Dark Tan, Violet and Beige/Violet. (Chinchilla Genetics)  chinchillas.com
   
 
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