All four B2 hybrid crosses

Sex-Linked Traits   XX-XY system

Heterozygote has a unique phenotype.


 

Reminder :

 

The P1 generation has genotypes A1A1 & A1Y1;   The P2 generation has genotypes A2A2 & A2Y2.  The F1 has genotypes A1A2 & A1Y2 and the F1' generation has genotypes A1A2 & A2Y1

 

 

Hybrid Cross Expected Phenotypes:
A2 allele is incompletely dominant

Expected Phenotypes:
A2 allele is overdominant

Expected Phenotypes:
A2 allele is codominant

B2

100% of the females have a phenotype intermediate to the P1 and P2 phenotypes. 100% of the males have the P2 phenotype. 100% of the females have a phenotype more extreme than either the P1 and P2 phenotypes. 100% of the males have the P2 phenotype.  100% of the females have both the P1 and P2 phenotypes., simultaneously.  100% of the males have the P2 phenotype.
 B2'  1/2 the females have the P2 phenotype and 1/2 the females have a phenotype intermediate to the P1 and P2 phenotypes.

 

 

1/2 the males have the P1 and 1/2 the males have the P2 phenotype.

 1/2 the females have the P2 phenotype and 1/2 the females have more extreme than either the P1 and P2 phenotypes.

 

 

1/2 the males have the P1 and 1/2 the males have the P2 phenotype.

1/2 the females have the P2 phenotype  line and 1/2 of the females have both the P1 and P2 phenotypes, simultaneously.

 

1/2 the males have the P1 and 1/2 the males have the P2 phenotype.

 B2''

100% of the females and 100% of the males have the P2 phenotype.

 100% of the females and 100% of the males have the P2 phenotype. 100% of the females and 100% of the males have the P2 phenotype.
 B2'''  1/2 the females have the P1 phenotype and 1/2 the females have a phenotype intermediate to the P1 and P2 phenotypes.

 

 

1/2 the males have the P1 and 1/2 the males have the P2 phenotype.

 1/2 the females have the P1 phenotype and 1/2 the females have more extreme than either the P1 and P2 phenotypes.

 

 

1/2 the males have the P1 and 1/2 the males have the P2 phenotype.

1/2 the females have the P1 phenotype  line and 1/2 of the females have both the P1 and P2 phenotypes, simultaneously.

 

1/2 the males have the P1 and 1/2 the males have the P2 phenotype.


 

B2 crosses
1 Definition
2 Single Autosomal Traits - All dominance patterns
4 Single Sex-linked Trait (XY)  - Complete Dominance dominance
4 Single Sex-linked Trait (XY)  - Other dominance patterns
5 Single Sex-linked Trait (ZW)  - All dominance patterns (inactive)
5 Two autosomal traits - unlinked genes -All dominance patterns (inactive)
6 Two autosomal traits -linked genes - All dominance patterns (inactive)
7 Some general rules for two or more genes (inactive)
8 Problems (inactive)
  Also See  - Test Crosses
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