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

What do filled symbols represent in a pedigree chart?

Back

Filled symbols represent individuals that express the trait being studied.

Front

What do half-filled symbols represent in a pedigree chart?

Back

Half-filled symbols represent individuals who are carriers of the trait (heterozygous) but do not express it.

Front

How do you determine the number of daughters in a pedigree chart?

Back

Count the number of female symbols in the generation of interest.

Front

How do you determine the number of males in a pedigree chart that show a specific trait?

Back

Count the number of male symbols that are filled in for the trait being studied.

Front

What does it mean if an individual has both recessive alleles?

Back

It means the individual expresses the recessive trait.

Front

What is the significance of the first generation in a pedigree chart?

Back

The first generation typically represents the parents or founders of the lineage being studied.

Front

How can you identify carriers in a pedigree chart?

Back

Carriers can be identified by half-filled symbols, indicating they possess one dominant and one recessive allele.

Front

What is the purpose of using pedigree charts in genetics?

Back

Pedigree charts are used to track the inheritance of traits and to understand genetic disorders within families.

Front

How can you tell if a trait is dominant or recessive from a pedigree chart?

Back

If the trait appears in every generation, it is likely dominant; if it skips generations, it may be recessive.