Basic Genetics: Agouti |
Gene A, a |
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AGOUTI gene AGene A is responsible that each hair gets yellow banded. |
Non-Agouti gene aGene a is recessive to gene A. If a cat carries gene a double (aa) then its coat colour
gets solid und you cannot see the underlying tabby pattern which is present in each cat. |
an agouti hair with the yellow banding |
Gene combinations
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Non-diluted colours |
Diluted colours |
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colour | gene combination | colour | gene combination | colour | gene combination | colour | gene combination | |
black | aa B- D- oo | black tabby | A- B- D- oo | blue | aa B- dd oo | blue tabby | A- B- dd oo | Gene A must be present only once to see the tabby pattern already. For
"A-" you may put AA or Aa. For "B-" you may put BB, Bb, Bbc. For "D-" you may put DD or Dd. |
chocolate | aa b- D- oo | chocolate tabby | A- b- D- oo | lilac | aa b- dd oo | lilac tabby | A- b- dd oo | For "b-" you may put bb or bbc. |
cinnamon | aa bcbc D- oo | cinnamon tabby | A- bcbc D- oo | fawn | aa bcbc dd oo | fawn tabby | A- bcbc dd oo | |
red self | male: aa -- D- OY or A- -- D- OY female: aa -- D- OO or A- -- D- OO |
red tabby | male: aa -- D- OY or A- -- D- OY female: aa -- D- OO or A- -- D- OO |
cream | male: aa -- dd OY or A- -- dd OY female: aa -- dd OO or A- -- dd OO |
cream tabby | male: aa -- dd OY or A- -- dd OY female: aa -- dd OO or A- -- dd OO |
For "--" you may put BB, Bb, Bbc or bb, bbc or bcbc. Remember
that gene O colours all hairs to red regardless their colour. Remember also that between a red self and a red tabby is no difference. |
black tortie | aa B- D- Oo | black tortie tabby | A- B- D- Oo | blue tortie | aa B- dd Oo | blue tortie tabby | A- B- dd Oo | Note that all torties are females. Tortie tabbies are often called torbies. |
chocolate tortie | aa b- D- Oo | chocolate tortie tabby | A- b- D- Oo | lilac tortie | aa b- dd Oo | lilac tortie tabby | A- b- dd Oo | |
cinnamon tortie | aa bcbc D- Oo | cinnamon tortie tabby | A- bcbc D- Oo | fawn tortie | aa bcbc dd Oo | fawn tortie tabby | A- bcbc dd Oo | You can imagine that it is very difficult to see the red patches in a rich coloured cinnamon tortie or see the cream patches in a dull coloured fawn tortie. |
Example 1
One way to find out would be to mate her with a black male.
We assume, that both the female and the male don't carry chocolate or cinnamon. Our female
can have the following genetic background:
aa BB D- OO or
Aa BB D- OO or
AA BB D- OO
Our black male has the genetic background:
aa BB D- oY
Case 1: We have a female with aa BB D- OO In that case we don't find out, if our female carries Agouti or not, because
on the red or red tabby males we can't see if they have Agouti or not. |
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Case 2: We have a female with Aa BB D- OO Here we are more lucky, because on the black/blue tortie tabby females we clearly can make the conclusion that our female must carry at least one Agouti gene. |
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Case 3: We have a female with AA BB D- OO Also in that case we only can come to the conclusion that our female must carry at least one Agouti gene, because of the black/blue tortie tabby litter. But with the red boys we still cannot say if they carry Agouti or not. |
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Last modified on 99-02-24