I started to create a page describing basic Herp Genetics, but I found an excellent set of webpages created by New England Reptile Distributors that give a terrific presentation and background on Herp Genetics! There's no reason to reinvent the wheel when they have done such a masterful job, so if you need to learn the basics of Herp Genetics, please visit NERD's Intro to Reptile Genetics.
I have listed below the potential breeding outcomes of litters from the snakes that I have or that I have available for sale. If you would like to see what a Co-dominant breeding could look like (a motley, jungle, hypo, etc.) look at the Breeding Co-dominant Boas page. Please remember that these outcomes are according to the Punnett Square, and actual outcomes may (and probably will) differ, especially if the litter is small. Click the Plus sign next to each breeding matchup to see the results. If needed, a list of genetic terms can be found here.
Key of Alleles:
A - Normal allele for melanin production
a - Recessive allele for albinism
N - Normal allele for erythrin production
n - recessive allele for anerytherism
- 1. Double Het Sharp Snow (Het Sharp Albino, Het Anery) x Double Het Sharp Snow (Het Sharp Albino, Het Anery):
| DH Sharp Snow (Albino & Anery - AaNn) x DH Sharp Snow (Albino & Anery - AaNn) |
|---|
Possible Gene Pairings (Gametes) | AN | An | aN | an |
AN | AANN | AANn | AaNN | AaNn |
|---|
An | AANn | AAnn | AaNn | Aann |
|---|
aN | AaNN | AaNn | aaNN | aaNn |
|---|
an | AaNn | Aann | aaNn | aann |
|---|
- Result Totals (for every 16 offspring):
- (1) Snow (aann) (6.3% of litter)
- (2) Albinos Het for Anery (aaNn) (12.5% of litter)
- (1) Albino (aaNN) (6.3% of litter)
- (2) Anerys Het for Albino (Aann) (12.5% of litter)
- (1) Anery (AAnn) (6.3% of litter)
- (4) Double Hets for Sharp Snow (Anery and Albino) (AaNn) (25% of litter)
- (2) Het for Albino (AaNN) (12.5% of litter)
- (2) Het for Anery (AANn) (12.5% of litter)
- (1) Normal (AANN) (6.3% of litter)
- Detail of Result Totals:
Genotypic Ratio of Possible Offspring | Genotype | Phenotypic Ratio of Possible Offspring | Phenotype | Probability |
1 | AANN | Normal | 9 | Normal 66% Possible DH Snow (Albino and Anery) OR 44.4% Poss. DH, 22.2% Poss. Het for Albino, and 22.2% Poss. Het for Anery | 6.3% |
2 | AANn | Normal Het for Anery | 12.5% |
2 | AaNN | Normal Het for Albino | 12.5% |
4 | AaNn | Double Het for Albino & Anery | 25% |
1 | AAnn | Anery | 3 | Anery 66% Possible Het for Albino (Het Snow) | 6.3% |
2 | Aann | Anery and Het for Albino | 12.5% |
1 | aaNN | Albino | 3 | Albino 66% Possible Het for Anery (Het Snow) | 6.3% |
2 | aaNn | Albino and Het for Anery | 12.5% |
1 | aann | Albino and Anery | 1 | Snow | 6.3% |
- 2. Double Het Sharp Snow (Het Sharp Albino, Het Anery) x Sharp Albino Het Anery:
| DH Sharp Snow (Albino & Anery - AaNn) x Sharp Albino Het Anery (aaNn) |
|---|
Possible Gene Pairings (Gametes) | aN | an |
AN | AaNN | AaNn |
|---|
An | AaNn | Aann |
|---|
aN | aaNN | aaNn |
|---|
an | aaNn | aann |
|---|
- Result Totals (for every 8 offspring):
- (1) Snow (aann) (12.5% of litter)
- (2) Albino Het for Anery (aaNn) (25% of litter)
- (1) Albino (aaNN) (12.5% of litter)
- (1) Anery Het for Albino (Aann) (12.5% of litter)
- (2) Double Het for Sharp Snow (Anery and Albino) (AaNn) (25% of litter)
- (1) Het for Albino (AaNN) (12.5% of litter)
- Detail of Result Totals:
Genotypic Ratio of Possible Offspring | Genotype | Phenotypic Ratio of Possible Offspring | Phenotype | Probability |
1 | AaNN | Normal Het for Albino | 3 | Normal 66% Possible DH Snow (Albino and Anery) | 12.5% |
2 | AaNn | Double Het for Albino & Anery | 25% |
1 | Aann | Anery and Het for Albino | 1 | Anery Het for Albino (Het Snow) | 12.5% |
1 | aaNN | Albino | 3 | Albino 66% Possible Het for Anery (Het Snow) | 12.5% |
2 | aaNn | Albino and Het for Anery | 25% |
1 | aann | Albino and Anery | 1 | Snow | 12.5% |
- 3. Double Het Sharp Snow (Het Sharp Albino, Het Anery) x Anery Het Sharp Albino:
| DH Sharp Snow (Albino & Anery - AaNn) x Anery Het Sharp Albino (Aann) |
|---|
Possible Gene Pairings (Gametes) | An | an |
AN | AANn | AaNn |
|---|
An | AAnn | Aann |
|---|
aN | AaNn | aaNn |
|---|
an | Aann | aann |
|---|
- Result Totals (for every 8 offspring):
- (1) Snow (aann) (12.5% of litter)
- (1) Albino Het for Anery (aaNn) (12.5% of litter)
- (2) Anery Het for Albino (Aann) (25% of litter)
- (1) Anery (AAnn) (12.5% of litter)
- (2) Double Het for Sharp Snow (Anery and Albino) (AaNn) (25% of litter)
- (1) Het for Anery (AANn) (12.5% of litter)
- Detail of Result Totals:
Genotypic Ratio of Possible Offspring | Genotype | Phenotypic Ratio of Possible Offspring | Phenotype | Probability |
1 | AANn | Normal Het for Anery | 3 | Normal 66% Possible DH Snow (Albino and Anery) | 12.5% |
2 | AANn | Double Het for Albino & Anery | 25% |
1 | AAnn | Anery | 3 | Anery 66% Possible Het for Albino (Het Snow) | 12.5% |
2 | Aann | Anery and Het for Albino | 25% |
1 | aaNn | Albino Het for Anery | 1 | Albino Het for Anery (Het Snow) | 12.5% |
1 | aann | Albino and Anery | 1 | Snow | 12.5% |
- 4. Double Het Sharp Snow (Het Sharp Albino, Het Anery) x Sharp Snow (Albino and Anery):
| DH Sharp Snow (Albino & Anery - AaNn) x Sharp Snow (aann) |
|---|
Possible Gene Pairings (Gametes) | an |
AN | AaNn |
|---|
| An | Aann |
|---|
| aN | aaNn |
|---|
an | aann |
|---|
- Result Totals (for every 4 offspring):
- (1) Snow (aann) (25% of litter)
- (1) Albino Het Anery (aaNn) (25% of litter)
- (1) Anery Het Albino (Aann) (25% of litter)
- (1) Double Het for Sharp Snow (Anery and Albino) (AaNn) (25% of litter)
- Detail of Result Totals:
Genotypic Ratio of Possible Offspring | Genotype | Phenotypic Ratio of Possible Offspring | Phenotype | Probability |
1 | AaNn | Double Het for Albino & Anery | 1 | Double Het for Albino & Anery (Snow) | 25% |
1 | Aann | Anery and Het Albino | 1 | Anery Het for Albino (Het Snow) | 25% |
1 | aaNn | Albino and Het Anery | 1 | Albino Het for Anery (Het Snow) | 25% |
1 | aann | Albino and Anery | 1 | Snow | 25% |
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