Pedigrees 2024

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, used to analyze the inheritance of traits.

Front

What does it mean if a trait is autosomal recessive?

Back

An autosomal recessive trait means that an individual must inherit two copies of the recessive allele (one from each parent) to express the trait.

Front

What is the genotype of an unaffected individual with an autosomal recessive trait?

Back

The genotype of an unaffected individual can be either homozygous dominant (AA) or heterozygous (Aa).

Front

What is the genotype of an affected individual with an autosomal recessive trait?

Back

The genotype of an affected individual must be homozygous recessive (aa).

Front

In a pedigree, what does a filled symbol represent?

Back

A filled symbol in a pedigree represents an individual who expresses the trait being studied.

Front

How many alleles does a child inherit from each parent?

Back

A child inherits one allele from each parent for a total of two alleles for each trait.

Front

What is the significance of the genotype 'hh' in a pedigree showing a recessive disorder?

Back

The genotype 'hh' indicates that the individual is affected by the recessive disorder.

Front

What is Cystic Fibrosis?

Back

Cystic Fibrosis is a genetic disorder caused by a recessive allele that affects the respiratory and digestive systems.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an individual, while phenotype refers to the observable traits or characteristics.

Front

What does it mean if an individual is heterozygous for a trait?

Back

An individual is heterozygous for a trait if they have two different alleles for that trait (e.g., Aa).