Defective Genes

[drgrey]

How can a defective allele present in one copy along with a wild type one, show the phenotype of a homozygous defective individual? Can you please give me an example?

[mith]

Assuming the wild type is functional, and the mutant nonfunctional, and if the wild type allele doesn't fully compensate you can see some of the effects.

[drgrey]

But why wouldn't the wild type fully compensate? What would be an example of this?

[mith]

Say you had an allele that coded for a red pigment in flowers, and the mutant makes a colorless variant. A pink heterozygote gives you a hint of what the homozygote looks like.

[MrMistery]

google "incomplete dominance"