Topic 1 Heredity: Phenotypic Expression

Question 1

• There are two important terms to understand why two individuals with the same genotype may not necessarily have the same phenotype

Answer 1

Note

Question 2

• This concept describes the probability an organism with a specific genotype will express a particular phenotype
  i. Complete penetrance means the genes for a trait are expressed in all of the population who have the gene
  ii. Incomplete penetrance means the genes for a trait are only expressed in a percentage of the population

Answer 2

1. Penetrance

Question 3

• This term describes the variation or range of phenotypes for a specific genotype
• For example, the gene for red hair could result in light hair, dark crimson hair, or any range of color in between.

Answer 3

2. Variable Expressivity