Pedigree Charts

Front

What is a pedigree chart?

Back

A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism and its ancestors, used to analyze the inheritance of traits.

Tags

NGSS.HS-LS3-1

Front

What does a filled circle represent in a pedigree chart?

Back

A filled circle represents a female who is affected by the trait being studied.

Front

What does a filled square represent in a pedigree chart?

Back

A filled square represents a male who is affected by the trait being studied.

Front

What does an empty circle represent in a pedigree chart?

Back

An empty circle represents a female who is unaffected by the trait being studied.

Front

What does an empty square represent in a pedigree chart?

Back

An empty square represents a male who is unaffected by the trait being studied.

Front

What does a diagonal line through a symbol indicate in a pedigree chart?

Back

A diagonal line through a symbol indicates that the individual is deceased.

Front

What is the difference between autosomal dominant and autosomal recessive traits?

Back

Autosomal dominant traits require only one copy of the dominant allele to be expressed, while autosomal recessive traits require two copies of the recessive allele.

Tags

NGSS.HS-LS3-1

Front

What is an X-linked trait?

Back

An X-linked trait is a trait associated with a gene located on the X chromosome, often affecting males more than females.

Front

How can you identify carriers in a pedigree chart?

Back

Carriers are individuals who have one copy of a recessive allele but do not express the trait; they are often represented by unfilled symbols connected to affected individuals.

Front

What does the Roman numeral represent in a pedigree chart?

Back

Roman numerals represent generations in a pedigree chart, with each numeral indicating a different generation.