GUIDE TO GENETIC OUTCOMES
for SILVER BREEDING PROGRAMS
Fiona Mangan
NIVALIS ABYSSINIANS
first published in THE ABYSSINIAN, journal of the Abyssinian Cat Club of Australasia, Inc., January, 1996
This guide has been compiled to give an indication of the average expected ratio of progeny from a variety of 'silver group' matings. The guide also indicates which matings give the greatest chance to produce a desired target colour. It is by no means a complete listing for all possible mating combinations.
All calculations, except for those in Table 1, are based on genotypes which are homozygous for 'silver' (i.e. cannot produce non-silver progeny). Calculations including coat length have not been considered for this guide.
In Tables 2 and 3, genotypes for colour variations are given in square brackets.
Ta (Abyssinian pattern tabby gene) and A (Agouti gene) have not been shown in genotypes as these are common to all Abyssinian colour variations.
| Key to all Tables | |
I
|
Suppression of pigmentation - Inhibitor gene (silver) |
i
|
Full pigmentation (non-silver) |
| D | Dense pigmentation |
| d | dilute pigmentation |
| B | Black pigment |
| b l | light brown pigment |
| SIL | Silver |
| CSIL | Cinnamon Silver |
| BSIL | Blue Silver |
| FSIL | Fawn Silver |
| (c) | Cinnamon carried |
| (b) | Blue carried |
| (cb) | Cinnamon and Blue carried |
Table 1 - Expected outcomes for silver and non-silver matings
| Genotype |
II
|
Ii
|
ii
|
all
Ii
appear SIL
|
½
Ii
- appear SIL
½
ii
- appear non-silver
|
Ii
|
½
II
½
Ii
all appear SIL |
¼
II
and ¼
Ii
- appear SIL
¼
ii
- appear non-silver
|
II
|
II
- all silver
|
Table 2 - Expected outcomes for various silver matings
| Parental Type | SIL | SIL (c) | SIL (b) | SIL (cb) |
SIL
[II
BBDD]
|
all SIL |
½ SIL
½ SIL (c) |
½ SIL
½ SIL (b) |
¼ SIL
¼ SIL (c) ¼ SIL (b) ¼ SIL (cb) |
CSIL
[
II
b
l
b
l
DD]
|
all SIL (c) |
½ SIL (c)
½ CSIL |
½ SIL (c)
½ SIL (cb) |
¼ SIL (c)
¼ SIL (cb) ¼ CSIL ¼ CSIL (b) |
BSIL
[
II
BBdd]
|
all SIL (b) |
½ SIL (cb)
½ BSIL |
½ SIL (b)
½ BSIL |
¼ SIL (b)
¼ SIL (cb) ¼ BSIL ¼ BSIL (c) |
FSIL
[
II
b
l
b
l
dd]
|
all SIL (cb) |
½ SIL (cb)
½ CSIL (b) |
½ SIL (cb)
½ BSIL (c) |
¼ SIL (cb)
¼ BSIL (c) ¼ CSIL (b) ¼ FSIL |
SIL (c)
[
II
Bb
l
DD]
|
¼ SIL
½ SIL (c) ¼ CSIL |
¼ SIL
¼ SIL (b) ¼ SIL (c) ¼ SIL (cb) |
1/8
SIL
1/8 CSIL 1/8 SIL (b) 1/8 CSIL (b) ¼ SIL (c) ¼ SIL (cb) |
|
SIL (b)
[
II
BBDd]
|
¼ SIL
½ SIL (b) ¼ BSIL |
1/8
SIL
1/8 BSIL 1/8 SIL (c) 1/8 BSIL (c) ¼ SIL (b) ¼ SIL (cb) |
||
SIL (cb)
[
II
Bb
l
Dd]
|
1/16
SIL
1/16 CSIL 1/16 BSIL 1/16 FSIL 1/8 SIL (c) 1/8 SIL (b) 1/8 CSIL (b) 1/8 BSIL (c) ¼ SIL (cb) |
Table 3 - Expected outcomes for Cinnamon Silver, Blue Silver and Fawn Silver combinations
| Parental Type | CSIL | CSIL (b) | BSIL | BSIL (c) | FSIL |
CSIL
[
II
b
l
b
l
DD]
|
all CSIL |
½ CSIL
½ CSIL (b) |
all SIL (cb) |
½ CSIL (b)
½ SIL (cb) |
all CSIL (b) |
CSIL (b)
[
II
b
l
b
l
Dd]
|
¼ CSIL
¼ CSIL (b) ¼ FSIL |
½ SIL (cb)
½ BSIL |
¼ SIL (cb)
¼ CSIL (b) ¼ BSIL (c) ¼ FSIL |
½ CSIL (b)
½ FSIL |
|
BSIL
[
II
BBdd]
|
all BSIL |
½ BSIL
½ BSIL (c) |
all BSIL (c) | ||
BSIL (c)
[
II
Bb
I
dd]
|
¼ BSIL
½ BSIL (c) ¼ FSIL |
½ BSIL (c)
½ FSIL |
|||
FSIL
[
II
b
I
b
I
dd]
|
all FSIL | ||||
SIL
[
II
BBDD]
|
all SIL (c) |
½ SIL (c)
½ SIL (cb) |
all SIL (b) |
½ SIL (b)
½ SIL (cb) |
all SIL (cb) |
SIL (c)
[
II
Bb
I
DD]
|
see
Table 2 |
¼ SIL (c)
¼ SIL (cb) ¼ CSIL ¼ CSIL (b) |
see
Table 2 |
¼ SIL (b)
½ SIL (cb) ¼ CSIL (b) |
½ SIL (cb)
½ CSIL (b) |
SIL (b)
[
II
BBDd]
|
see
Table 2 |
¼ SIL (c)
½ SIL (bc) ¼ BSIL (c) |
see
Table 2 |
¼ SIL (b)
¼ SIL (cb) ¼ BSIL ¼ BSIL (c) |
½ SIL (c)
½ BSIL (c) |
SIL (cb)
[
II
Bb
I
Dd]
|
see
Table 2 |
¼ SIL (cb)
¼ CSIL (b) 1/8 CSIL 1/8 FSIL 1/8 BSIL (c) 1/8 SIL (c) |
see
Table 2 |
¼ SIL (cb)
¼ BSIL (c) 1/8 BSIL 1/8 FSIL 1/8 CSIL (b) 1/8 SIL (b) |
¼ SIL (cb)
¼ BSIL (c) ¼ CSIL (b) ¼ FSIL |
|
to index |