Understanding Pedigrees in Genetics

What shape is used to represent females in a pedigree?

• Triangles

• Hexagons

• Squares

• Circles

What does a marriage line represent in a pedigree?

• Marriage between two individuals

• Parents to children

• Cousins

• Siblings

Which type of trait is being tracked in the provided pedigree example?

• Dominant

• Recessive

• Codominant

• Incomplete dominance

What genotype is represented by shaded shapes in the pedigree?

• Heterozygous

• Homozygous dominant

• Homozygous recessive

• Cannot be determined

If a father is not shaded and has a child with attached earlobes, what is his genotype?

• Cannot be determined

• ee

• Ee

• EE

How many siblings does the father have in the provided pedigree example?

• 2

• 3

• Cannot be determined

• 4

In a sex-linked pedigree, what chromosomes do females have represented next to their symbols?

• YY

• X

• XX

• XY

For a sex-linked recessive trait, what genotype must a female have to express the trait?

• XRXR

• XRXr

• XrXr

• XrY

What is the genotype of a carrier female for a sex-linked recessive trait?

• XrY

• XrXr

• XRXr

• XRXR

Why is it important to understand pedigrees in genetics?

• To create new genes

• To understand genetic disorders inheritance

• To predict future traits

• To study plant genetics only