Pedigrees Practice

Front

What is a pedigree?

Back

A pedigree is a diagram that shows the occurrence and appearance or phenotype of a particular gene or organism and its ancestors across generations.

Front

What does it mean if a trait is Autosomal Recessive?

Back

An Autosomal Recessive trait requires two copies of the recessive allele for the trait to be expressed. Individuals with one dominant and one recessive allele are carriers.

Front

What does a filled symbol represent in a pedigree?

Back

A filled symbol indicates that the individual expresses the trait being studied.

Front

What shape represents a female in a pedigree?

Back

A circle represents a female in a pedigree.

Front

What is the significance of half-colored symbols in a pedigree?

Back

Half-colored symbols represent individuals who are carriers (heterozygous) for a trait.

Front

How can you determine the inheritance pattern from a pedigree?

Back

By analyzing the pattern of affected and unaffected individuals across generations, you can infer whether the trait is dominant, recessive, sex-linked, etc.

Front

What does it mean if a trait is Sex Linked?

Back

A Sex Linked trait is associated with a gene located on a sex chromosome, often affecting males and females differently.

Front

What is the genotype of a carrier for a recessive trait?

Back

The genotype of a carrier for a recessive trait is heterozygous, represented as Aa.

Front

How do you identify the first generation in a pedigree?

Back

The first generation is typically represented at the top of the pedigree chart.

Front

What does a square symbol represent in a pedigree?

Back

A square symbol represents a male in a pedigree.