CROSSES AND PUNNETT SQUARE ANALYSIS INVOLVING SALMON BOAS
With respect to wild type (normal - ss), the salmon trait shows incomplete dominance and thus occurs in two forms: a heterozygous state (salmon - Ss) and a homozygous state (super salmon - SS).
S = salmon allele s = wildtype allele for salmon
|
|
Sire
x Dam
|
Genotypes
|
Phenotypes
|
Genotypic
Ratio
|
Phenotypic
Ratio
|
|
1
|
Ss x ss salmon x wildtype |
2
|
2
|
Ss:ss 1 : 1 |
salmon : wildtype 1 : 1 |
|
2
|
Ss x Ss salmon x salmon |
3
|
3
|
SS : Ss : ss 1 : 2 : 1 |
super salmon : salmon : wildtype 1 : 2 : 1 |
|
3
|
SS x ss super salmon x wildtype |
1
|
1
|
Ss 100% |
salmon 100% |
|
4
|
SS x Ss super salmon x salmon |
2
|
2
|
SS : Ss 1 : 1 |
super salmon : salmon 1 : 1 |
|
5
|
SS x SS super salmon x super salmon |
1
|
1
|
SS 100% |
super salmon 100% |
The following examples involve the crossing of albinism (aa) with the salmon gene. A "super salmon albino" is a super Sunglow and a "salmon albino" is a Sunglow.
A = wildtype allele for albino a = albino allele
|
Sire
x Dam
|
Genotypes
|
Phenotypes
|
Genotypic
Ratio
|
Phenotypic
Ratio
|
|
|
6
|
SsAA x ssaa salmon x albino |
2
|
2
|
SsAa : ssAa 1 : 1 |
salmon (het. for albino) : wildtype (het. for albino) 1 : 1 |
|
7
|
SsAa x SsAa salmon (het. for albino) x salmon (het. for albino) |
9
|
6
|
SSaa : SSAa : SSAA 1 : 2 : 1 SsAA : SsAa : Ssaa 2 : 4 : 2 ssAA : ssAa : ssaa 1 : 2 : 1
|
super salmon albino : super salmon 1 : 3 salmon albino : Salmon 2 : 6 albino : wildtype 1 : 3 |
|
8
|
SsAa x ssaa salmon (het. for albino) x albino |
4
|
4
|
SsAa : Ssaa : ssAa : ssaa 1 : 1 : 1 : 1 |
salmon albino : salmon 1 : 1 albino : wildtype 1 : 1 |