From this information, Niemann-Pick disease is an example of: A) variable expressivity B) incomplete dominance C) incomplete penetrance D) variable expressivity and incomplete penetrance   E) multiple alleles

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Niemann Pick Type C disease is a recessive disorder that causes the accumulation of cholesterol and other lipids in lysosomes, ultimately affecting both the liver and the nervous system.  Below are the genotypes and phenotypes of offspring of a family with a history of Niemann Pick. 

7 NN ( all normal phenotype)

3 Nn  (all normal phenotype)

4  nn (1 early onset dementia, 1 mid-life onset dementia, 2 late-onset dementia). 

 

From this information, Niemann-Pick disease is an example of:

A) variable expressivity

B) incomplete dominance

C) incomplete penetrance

D) variable expressivity and incomplete penetrance
 
E) multiple alleles
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