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 shape represents a male in a pedigree?

Back

A square represents a male in a pedigree.

Front

What shape represents a female in a pedigree?

Back

A circle represents a female in a pedigree.

Front

What does a filled shape indicate in a pedigree?

Back

A filled shape indicates that the individual has the trait being studied.

Front

What does an unfilled shape indicate in a pedigree?

Back

An unfilled shape indicates that the individual does not have the trait being studied.

Front

How do you determine the number of generations in a pedigree?

Back

Count the horizontal rows of shapes from the oldest generation at the top to the youngest at the bottom.

Front

What is a carrier in genetics?

Back

A carrier is an individual who has one copy of a recessive allele that does not manifest in their phenotype.

Front

How can you identify carriers in a pedigree?

Back

Carriers can often be identified by looking for individuals who have affected offspring but are not affected themselves.

Front

What is the significance of the second generation in a pedigree?

Back

The second generation often shows how traits are passed from parents to offspring and can indicate carriers.

Front

What is hemophilia?

Back

Hemophilia is a genetic disorder that impairs the body's ability to make blood clots.