Pedigree Charts

Pedigree Charts

• Show relationships within a family
• In genetics: Used to show how an

inherited trait is passed through a family

Example of Trait = Albinism

Symbols

• Circle = female
• Square = male
• Normal or without

trait = unshaded

• Trait = shaded

Fill in the Blanks

If a trait is expressed in a chart they will

the symbol.

Symbols

• If an individual

has one
recessive allele
for a trait, the
person is a
carrier. This is
shown with a
half-shaded
square or circle.

Dropdown

The difference between a carrier and one who expresses the trait is ​

Select answer

symbol. This usually means the trait is ​

Select answer

.

Symbols

• Married couple or

couple producing
offspring =
horizontal line
connecting
midpoint of circle
and square

Symbols

• One offspring

• Multiple Offspring

How do you
differentiate between
a brother and sister
and a husband and
wife on a pedigree?

Generations

• Each generation

is (often) labeled
with a Roman
numeral.

• Oldest generation

at top of pedigree

• Current

generation at
bottom

Labeling

Label the correct parts

Drag labels to their correct position on the image

Expressed Trait

Current Generation

Oldest Generation

Multiple Choice

How do they typically label each generation?

• Roman Numerals

• Alphabetically

• Naming Parental Generation

Generations

• Individuals in

each generation
may be
numbered or
named.

• Siblings are

placed in birth
order from left to
right.

1 2

1 2 3 4 5 6

1 2 3 4 5

Multiple Choice

Who was the first person to display the trait?

• Grandfather

• Grandmother

• Parent

• Aunt

Fill in the Blanks

How many offspring were produced by the first generation?

Fill in the Blanks

How many of generation II were married with children?

Fill in the Blanks

How many deaths occurred within the pedigree?

Drag and Drop

This trait appears to be a ​

Placeholder

trait.

Drag these tiles and drop them in the correct blank above

recessive

dominate

deadly

Fill in the Blanks

Who did individual #7 generation III inherit the trait from?

Polydactyl Trait

• Based on the

pedigree chart, is
the trait for
multiple digits
(fingers and toes)
dominant or
recessive?

• How can you tell?

Fill in the Blanks

How many people have this trait?

Fill in the Blanks

How many carrier are there of the trait?

Analyzing a Trait

• Sometimes a

pedigree is
drawn without
the carriers
shown.

Open Ended

Is this trait dominate or recessive? How can you tell?

Fill in the Blanks

Is the trait dominate or recessive?

Fill in the Blanks

Is the trait dominate or recessive?