Pedigree Charts

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

How many alleles does each person carry for a trait?

Back

Each person carries 2 alleles for a trait, one inherited from each parent.

Front

What does it mean to be a carrier of a trait?

Back

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

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even if only one copy is present, while recessive alleles require two copies to express the trait.

Front

How can you determine if an individual is affected by a recessive disorder in a pedigree chart?

Back

An individual is affected by a recessive disorder if they exhibit the trait and have two recessive alleles (hh).

Front

What does the symbol 'hh' represent in genetics?

Back

The symbol 'hh' represents a homozygous recessive genotype, indicating that the individual has two recessive alleles for a trait.

Front

In a pedigree chart, what does a filled circle represent?

Back

A filled circle represents a female who expresses the trait being studied.

Front

In a pedigree chart, what does a filled square represent?

Back

A filled square represents a male who expresses the trait being studied.

Front

What is the significance of the F1 generation in genetics?

Back

The F1 generation is the first generation of offspring resulting from a cross between two parental lines.

Front

How are cousins related in terms of pedigree charts?

Back

Cousins share a set of grandparents but have different parents.