GENETICS TERMS

Question 1

percentage of individuals carrying an autosomal dominant gene and expressive the trait

100% penetrance = if you carry the gene, you have the disease (Ex: Huntington’s Disease)

Answer 1

Penetrance

Question 2

showing a variety of different problems from patient to patient w/ the same autosomal dominant disease; not every person w/ the disease has the exact same symptoms (Ex: Myotonic Dystrophy)

Answer 2

Variable Expressivity

Question 3

a single gene w/ more than one dominant allele

Answer 3

Codominance

Question 4

different phenotypes exist in the same population

Answer 4

Polymorphism

Question 5

multiple end effects of a single mutant gene

Example: Marfan’s Syndrome causes skeletal, ocular, & CV problems from a single mutant fibrillin gene

Answer 5

Pleiotropism