Pedigrees for a test

What is a pedigree?

A diagram that shows genetic relationships among family members across generations.

Key symbol for male in a pedigree?

A square represents a male individual.

Key symbol for female in a pedigree?

A circle represents a female individual.

True or false: Pedigrees show only living individuals.

False, because they can include deceased individuals.

Difference between autosomal dominant and recessive traits?

Dominant traits appear in every generation; recessive traits may skip generations.

Fill in the blank: A shaded shape in a pedigree indicates _____.

An affected individual with a genetic trait or disorder.

What does a vertical line indicate in a pedigree?

It connects parents to their offspring.

True or false: All traits can be tracked using pedigrees.

False, because only heritable traits can be tracked.

What is a proband?

The first affected individual in a pedigree who brings attention to the study.

Key symbol for unaffected individuals?

An unshaded shape represents an unaffected person.

Example of an autosomal recessive disorder?

Cystic fibrosis is an example of an autosomal recessive disorder.

What does a double line indicate?

A consanguineous (related) marriage between individuals.

True or false: Males can only inherit X-linked traits from their fathers.

True, because males inherit their X chromosome from their mothers.

Difference between X-linked and Y-linked traits?

X-linked traits are on the X chromosome; Y-linked traits are found on the Y chromosome.

What is the significance of generation labels in pedigrees?

They help in identifying the lineage and inheritance patterns.

Quiz: What is the purpose of a pedigree?

To study hereditary patterns in genetics.

Fill in the blank: Half-shaded shapes indicate _____.

Individuals that are carriers of the trait.

Key symbol for a marriage in a pedigree?

A horizontal line connects two shapes to indicate marriage.