2023 Mode of Inheritance Pedigrees

Front

What is an autosomal recessive disorder?

Back

A genetic condition that occurs when an individual inherits two copies of a recessive allele, one from each parent.

Front

What is the genotype of an individual with an autosomal recessive disorder?

Back

hh

Front

What does it mean if a pedigree shows an X-linked recessive inheritance pattern?

Back

The disorder is passed down through the X chromosome, affecting males more frequently than females.

Front

What is the genotype of a carrier for an autosomal recessive disorder?

Back

Hh

Front

What is the mode of inheritance for a trait that appears in every generation?

Back

Autosomal Dominant

Front

What is the mode of inheritance for a trait that skips generations?

Back

Autosomal Recessive

Front

How can you identify an X-linked dominant trait in a pedigree?

Back

It affects both males and females, but affected males pass the trait to all daughters and no sons.

Front

What is the significance of a filled symbol in a pedigree chart?

Back

It indicates that the individual is affected by the genetic condition.

Front

What does a half-filled symbol represent in a pedigree chart?

Back

It indicates that the individual is a carrier of the genetic condition.

Front

What is the probability of two carriers (Hh) having an affected child (hh)?

Back

25%.