Genetics and Pedigree Analysis

What is the primary purpose of a pedigree chart?

• To show a family's favorite recipes.

• To track the inheritance of a specific trait across generations.

• To list all family members' birthdays.

• To map out a family's travel history.

In a pedigree chart, what do circles and squares typically represent?

• Circles represent males, squares represent females.

• Circles represent females, squares represent males.

• Circles represent affected individuals, squares represent unaffected individuals.

• Circles represent parents, squares represent children.

If a trait is autosomal recessive, what does a shaded shape in a pedigree indicate about an individual's genotype?

• The individual is heterozygous for the trait.

• The individual is homozygous dominant for the trait.

• The individual is homozygous recessive for the trait.

• The individual is a carrier but does not express the trait.

In a pedigree tracking an autosomal recessive trait (like attached earlobes, represented by 'ee'), if a parent has free earlobes (unshaded) but has a child with attached earlobes (shaded 'ee'), what must the parent's genotype be?

• Homozygous dominant (EE)

• Homozygous recessive (ee)

• Heterozygous (Ee)

• Cannot be determined from the information given.

In a pedigree chart for an autosomal recessive trait, if one parent has the genotype 'ee' and the other parent does not show the trait, what is the genotype of their children who also do not show the trait?

• Ee

• EE

• ee

• EE or ee

In a pedigree chart for an autosomal recessive trait, if an individual does not show the trait but has children who do show the trait, what is the genotype of that individual?

• Ee

• EE

• ee

• Cannot be determined

For a sex-linked recessive trait, what is the genotype of a male who shows the trait?

• XRXr

• XrY

• XRY

• XrXr

In a pedigree chart for a sex-linked recessive trait, if a female does not show the trait but has a son who does show the trait, what is her genotype?

• XRXr

• XRXR

• XrXr

• XRY