Pedigrees

Front

What is a pedigree?

Back

A pedigree is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism and its ancestors.

Front

What do we use pedigrees for?

Back

To track traits in families.

Front

How many generations are typically represented in a pedigree chart?

Back

Pedigree charts can represent multiple generations, often three or more.

Front

What symbol represents an affected male in a pedigree?

Back

A filled square.

Front

What symbol represents an affected female in a pedigree?

Back

A filled circle.

Front

How are individuals III-2 and II-4 related in a pedigree?

Back

Uncle and niece.

Front

What does a horizontal line connecting a male and female represent in a pedigree?

Back

It represents a mating or marriage.

Front

What does a vertical line connecting parents to their offspring represent in a pedigree?

Back

It represents the offspring of the parents.

Front

How can you determine the inheritance pattern of a trait using a pedigree?

Back

By analyzing the presence or absence of the trait in each generation and among relatives.

Front

What is the significance of a double line connecting two individuals in a pedigree?

Back

It indicates consanguinity, or a mating between relatives.