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Evolution: The Molecular Landscape

Cold Spring Harbor’s 74th Symposium
EVOLUTION
The Molecular Landscape
Edited by Bruce Stillman,
David Stewart, and
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Cold Spring Harbor Laboratory

   
 

Testing the Dominance Theory

Figure WN22.6 - The dominance theory can be tested by constructing “unbalanced” females, which carry two X chromosomes from the same species.

Figure WN22.6. The dominance theory can be tested by constructing “unbalanced” females, which carry two X chromosomes from the same species. If F1 males are inviable because they carry a recessive allele that is incompatible with the hybrid autosomal genotype (top), then F1 females with heterozygous X chromosomes will be viable (middle). However, the recessive allele will be expressed in “unbalanced” females that have homozygous X chromosomes, just as in the F1 male (bottom). (After Fig. 2 of Orr 1997a.)

 
 
 

 
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