why might a genotype not match a phenotype on the taste test of PCR?

Expert Solution

Because of incomplete penetrance

Incomplete penetrance or penetrant of a trait is defined as the ability of the trait to express itself in a given population if the genotype is related to the trait.

For example, genotypes of taster is TT and Tt and the expected phenotype is that the individual will be able to taste the the phenylthiocarbamide paper. But because that trait tasting is not completely penetrant, then the individual will not be able to taste the paper even if the genotype is dominant.

All the pedigree and crosses which we make and determine probability of affected and normal progenies are under ideal condition. Under real condition, the probability values are changed because of the incomplete penetrance and expressivity of a treat. Penetrance is the ability of a trait to express itself in a given population with different degrees and expressivity is the ability of a trait to express itself in a given individual with different degrees.

Note that all the traits are not penetrant and expressive.

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gladiator answered 2 years ago

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