Transcript Pedigrees

Pedigree Charts
Draw a chart showing your family.
(parents and children)
Used to show how a trait is passed
from one generation to the next
= Does not express the trait (unaffected)
= Expresses the trait (affected)
= Carrier of the trait (unaffected, carrier)
= Male
= Female
B = Normal (dominant)
b = Extra-Long pointer finger (recessive)
What are the genotypes of the following?
If it is an X-Linked trait, what are they?
Symbol
Description
Unaffected male
Unaffected female
Affected male
COPY THIS TABLE
into your NOTES
Affected female
Deceased male
Deceased female
Possibly affected male
(unknown)
Possibly affected female
(unknown)
Carrier male
Carrier female
Carrier female with an Xlinked disorder
Connected Symbols:
Siblings
Twins
Married Couple
Divorced Couple
Which ones are actually carriers?
1. Re-draw this pedigree chart WITH the
CARRIERS shaded in 1/2 way
Royal Hemophilia
- Started by a mutant allele in Queen Victoria of England.
- Three of her nine children received the defective allele.
- They transferred it by marriage to other royal families.
Queen
Victoria
Fig. 8.28
Pedigree charts support or refute predictions.
YOUR TASK:
1. Prepare a Punnett Square and state the
probability of offspring phenotypes for
each child based on the pedigree below.
2. Compare (in a sentence!) the actual
phenotypes with the predictions.
Pedigree Story
In your group, write a story that can be
illustrated with a pedigree. (~10 minutes)
• DRAW the pedigree first! (to be used as a
key)
• Include: 3 generations, 5 relations, names!
• Trade with another group and draw a
pedigree based on their story.
Example:
Johnny has three sisters. One sister (April)
is from the same mother, Joan. Joan’s
father, Bill, was a brick layer, which is how
he met Jenny, his wife.
Can you be your own grandfather?
• The Ultimate Pedigree Challenge!!!!!!!!!!!!!!!
- Listen to the song (I’m My Own Grandpa)
- Write out a pedigree chart for the
family
• Lyrics: http://www.youtube.com/watch?v=7AvG6q_iTcA
• Muppets version: http://www.youtube.com/watch?v=q0s5Kn9QXtU