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, often used to track genetic traits.

Front

How is hemophilia inherited?

Back

Hemophilia is typically inherited in an X-linked recessive pattern, meaning it is passed down through the X chromosome.

Front

What shape represents a female in a pedigree?

Back

A circle represents a female in a pedigree.

Front

What shape represents a male in a pedigree?

Back

A square represents a male in a pedigree.

Front

What does it mean if an individual is shaded in a pedigree?

Back

Shaded individuals in a pedigree typically indicate that the individual expresses the trait being studied.

Front

How can you determine the number of affected individuals in a pedigree?

Back

Count the shaded shapes in the pedigree diagram to determine the number of affected individuals.

Front

What is the significance of Roman numerals in a pedigree?

Back

Roman numerals are used to denote generations in a pedigree, with each numeral representing a different generation.

Front

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

Back

A horizontal line connecting a male and female represents a mating or marriage.

Front

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

Back

A vertical line connecting parents to offspring indicates the offspring of those parents.

Front

What is the role of carriers in genetic inheritance?

Back

Carriers are individuals who have one copy of a recessive allele that does not manifest in their phenotype but can be passed to offspring.