Expect the Unexpected Phenotype: Penetrance and Expressivity

Let's learn about penetrance and expressivity, and see how those important genetics concepts can make for unexpected phenotypes. Examples of incomplete penetrance and variable expressivity show how genotype and phenotype aren't always a match.
#penetrance #expressivity #incompletepenetrance #completepenetrance #variableexpressivity

00:00 Intro
0:16 What is Penetrance*? Example of *Complete Penetrance (Full Penetrance)
0:54 Example of Incomplete Penetrance (Reduced Penetrance)
2:02 Penetrance of Huntington's Disease alleles
3:15 What is *Expressivity*?
3:34 Example of Constant Expressivity (Narrow Expressivity)
3:55 Example of Variable Expressivity (Broad Expressivity)
4:38 Polydactyly shows incomplete penetrance and variable expressivity
5:08 Why incomplete penetrance and variable expressivity?
5:44 Review penetrance and expressivity

Want to learn more? Try these related videos:
Genotype and Phenotype Explained:    • Genotype and Phenotype Explained! With Exa...  
Why are some Alleles Dominant (or Recessive)?:    • Why Are Some Alleles Dominant or Recessive?  

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[note: this video is a re-upload to correct a glitchy animation in the original version!]