Penetrance and Expressivity

[Soccerdoc11]

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I have seen these terms on a few Kaplan questions in the past and never really touched upon it in my Genetics class but I was just wondering to what extent do you think we have to know these and what's a proper definition to go by. Thanks again..

 

[niranjan162]

doubt they would come up unless explained in a passage

 

[Steveoph]

It's in TPR Genetics section, might be worth knowing especially with the genetics focus.
http://en.wikipedia.org/wiki/Penetrance
http://en.wikipedia.org/wiki/Expressivity