Pedigrees

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, often used to track inheritance patterns.

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that is expressed in the phenotype even when only one copy of the allele is present.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that is expressed in the phenotype only when two copies of the allele are present.

Front

What is a carrier in genetics?

Back

A carrier is an individual who has one copy of a recessive allele that does not manifest in the phenotype but can be passed to offspring.

Front

How can you determine the genotype of an individual from a pedigree?

Back

You can determine the genotype by analyzing the phenotypes of the individual and their relatives, considering the inheritance patterns.

Front

What is the significance of skipping generations in a pedigree?

Back

Skipping generations often indicates that the trait is recessive, as it may not be expressed in every generation.

Front

What does the notation 'Hh' represent?

Back

The notation 'Hh' represents a heterozygous genotype, where one allele is dominant (H) and the other is recessive (h).

Front

What does the notation 'hh' represent?

Back

The notation 'hh' represents a homozygous recessive genotype, where both alleles are recessive.

Front

What is the purpose of using symbols in pedigrees?

Back

Symbols in pedigrees help to visually represent individuals, their relationships, and the presence of traits, making it easier to analyze inheritance patterns.

Front

What does it mean if two individuals in a pedigree are connected by a horizontal line?

Back

A horizontal line between two individuals indicates that they are married or in a partnership.