Pedigree Practice

Front

What is a pedigree chart?

Back

A pedigree chart 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 dominant?

Back

A dominant trait is one that will appear in the phenotype even if only one copy of the allele is present. It masks the effect of a recessive allele.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that will only appear in the phenotype if two copies of the allele are present. It is masked by a dominant allele.

Front

What is the genotype for an individual with a recessive disorder?

Back

The genotype for an individual with a recessive disorder is 'hh', meaning they have two recessive alleles.

Front

How can you identify carriers of a recessive trait?

Back

Carriers of a recessive trait have one dominant and one recessive allele (Hh) and do not express the trait but can pass the recessive allele to offspring.

Front

What is the significance of the 'H' allele in Huntington's Disease?

Back

The 'H' allele represents the dominant allele for Huntington's Disease, meaning individuals with at least one 'H' allele will express the disease.

Front

How are siblings related in a pedigree chart?

Back

Siblings share the same parents and are typically represented by connecting lines to the same parental node in a pedigree chart.

Front

What is the relationship between an uncle and niece in a pedigree?

Back

An uncle is the brother of a child's parent, and a niece is the daughter of a sibling, showing a direct familial connection.

Front

What does it mean if two individuals in a pedigree are married?

Back

If two individuals in a pedigree are married, they are connected by a horizontal line, indicating a partnership that may produce offspring.

Front

What is the purpose of analyzing a pedigree chart?

Back

The purpose of analyzing a pedigree chart is to track the inheritance of traits and understand genetic relationships within a family.