Defective Genes

Genetics as it applies to evolution, molecular biology, and medical aspects.

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drgrey
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Defective Genes

Post by drgrey » Wed Oct 31, 2007 7:51 pm

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?

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mith
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Post by mith » Wed Oct 31, 2007 9:12 pm

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.
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Post by drgrey » Thu Nov 01, 2007 2:09 am

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

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mith
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Post by mith » Thu Nov 01, 2007 2:34 am

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.
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MrMistery
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Post by MrMistery » Thu Nov 01, 2007 12:43 pm

google "incomplete dominance"
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