Honors Bio Intro to Pedigrees

What do we use pedigrees for?

• To look at families
• To make determinations about the offspring
• To track traits in families
• Nothing

In a pedigree, what shape represents a male?

• circle
• square
• triangle
• diamond

How many generations are shown in this pedigree?

• 1
• 2
• 3
• 4

What does an open circle represent?

• Not Affected Male
• Not Affected Female
• Affected Male
• Affected Female

What does a filled in square represent?

• Not affected Female
• Not affected Male
• Affected Male
• Affected Female

This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?

• 8
• 5
• 2
• 3

Is this trait (the shaded individuals) dominant or recessive?

• dominant
• recessive

What is a pedigree chart?

• The probability of having different types of offspring

• A family tree that shows inherited characteristics

• An tool that shows the possible combinations of alleles

Answer explanation

A pedigree chart shows you how one characteristic is passed down in a family. You can even predict their genotype.

What could the genotype of the father?

• AA

• aa

• Aa

• AA or Aa

On this pedigree, the allele for curly hair is dominant. The couple labeled 2 both have curly hair, but have a daughter who does not have curly hair. Therefore, we can tell from the chart that for the couple labeled 2 -

• the male is heterozygous and the female is heterozygous.

• the male is homozygous recessive and the female is homozygous dominant.