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

 

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