Understanding Pedigrees and Genetic Traits

What shape is used to represent females in a pedigree?

• Circle

• Square

• Triangle

• Hexagon

What does a shaded shape in a pedigree typically indicate?

• Carrier of a trait

• Recessive trait

• No genetic trait

• Dominant trait

If a trait is autosomal recessive, what would be the genotype of an individual expressing this trait?

• aa

• AA

• Aa

• Aa or AA

In a pedigree, if a father is a carrier of a recessive trait and has the phenotype of the dominant trait, what is his genotype?

• AA

• Aa

• aa

• Either AA or Aa

Tags

NGSS.HS-LS3-1

How many siblings does the father have in the discussed pedigree?

• One

• Four

• Three

• Two

What is the phenotype of the paternal grandfather in the pedigree?

• Carrier of free earlobes

• Cannot be determined

• Free earlobes

• Attached earlobes

Tags

NGSS.HS-LS3-1

In a sex-linked recessive trait, what would be the genotype of a female carrier?

• Xx

• Xx or XX

• XX

• XY

What chromosomes do females have that are indicated in a sex-linked pedigree?

• Either XX or XY

• XY

• XX

• YY

What does half-shading in a pedigree symbolize?

• No genetic trait

• Dominant trait

• Recessive trait

• Carrier of the trait

Why is it important to understand pedigrees in genetics?

• To study plant genetics

• To predict hair color

• To understand genetic disorders

• To choose traits

Tags

NGSS.HS-LS3-1