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| Tabby (T) | T--dominant. Mackerel tabby stripes
t--recessive. Classic tabby stripes |
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| Agouti (A) | A--dominant. agouti pattern
a--recessive. non-agouti |
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| Black (B) | B--dominant. Black
b--recessive. Brown |
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| Piebald spotting (S) | S--dominant. White spotting
s--recessive. No white spots |
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| X-linked orange (O) | O--Orange color
o--non-orange color |
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Genotypes for examples in class: |
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| Standard wild-type. A generic housecat
aka Mackerel tabby |
o/o or o/Y ; B_; A_; ss; T_ | |
| Classic (blotched) tabby | o/o or o/Y ; B_; A_; ss; tt | |
| White spotted classic tabby | o/o or o/Y ; B_; A_; Ss; tt | |
| Black and white | o/o or o/Y ; B_; aa; Ss; ?? | |
| Orange and white classic tabby | O/O or O/Y; ??; ??; Ss; tt | |
| Calico (classic stripes) | O/o; B_; aa; Ss; tt | |
Some genetic interactions in these examples:
Orange (O) is epistatic to: B_, bb, T_, tt, aa
Non-agouti (aa) is epistatic to T_, tt, o
S is epistatic to all in cells where S is expressed
S exhibits variable expressivity at the level of the organism and variable penetrance at the level of individual cells.
O/o exhibits mosaic expression. It can also exhibit variable expressivity of O and o.