All four B1 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

 

 

B1

Males and females have same phenotypes as males and females in the P1 line Males and females have same phenotypes as males and females in the P1 line Males and females have same phenotypes as males and females in the P1 line
 B1'  1/2 the females have the same phenotype as the females in the in the P1 line and 1/2 the females have the phenotype intermediate to females in the  P1 and P2 lines.

 

1/2 the males have the same phenotype as the males in the in the P1 line and 1/2 the males have the same phenotype as the males in the P2 line.

 

1/2 the females have the same phenotype as the females in the in the P1 line and 1/2 the females have the phenotype more extreme than females in the  P1 and P2 lines.

 

1/2 the males have the same phenotype as the males in the in the P1 line and 1/2 the males have the same phenotype as the males in the P2 line.

 

 1/2 the females have the same phenotype as the females in the in the P1 line and 1/2 the females have the phenotypes of both the females in the P1 and P2 lines.

 

1/2 the males have the same phenotype as the males in the in the P1 line and 1/2 the males have the same phenotype as the males in the P2 line.

 
 B1''

All the females have the phenotype intermediate to females in the  P1 and P2 lines.

 

All of the males will have the phenotype of  the  P1 males.

 

All the females have a phenotype

more extreme than females in the  P1 and P2 lines.

 

All of the males will have the phenotype of  the  P1 males.

 

 All the females have

the phenotypes of both the females in the  P1 and P2 lines.

 

All of the males will have the phenotype of  the  P1 males.
 B1'''

 1/2 the females have the same phenotype as the females in the in the P1 line and 1/2 the females have the phenotype intermediate to females in the  P1 and P2 lines.

 

1/2 the males have the same phenotype as the males in the in the P1 line and 1/2 the males have the same phenotype as the males in the in the P2 line.

 

1/2 the females have the same phenotype as the females in the in the P1 line and 1/2 the females have the phenotype more extreme than females in the  P1 and P2 lines.

 

1/2 the males have the same phenotype as the males in the in the P1 line and 1/2 the males have the same phenotype as the males in the in the P2 line.

 

 1/2 the females have the same phenotype as the females in the in the P1 line and 1/2 the females have the phenotypes of both the females in the  P1 and P2 lines.

 

1/2 the males have the same phenotype as the males in the in the P1 line and 1/2 the males have the same phenotype as the males in the in the P2 line.

 

 


 

B1 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)
   
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