pedigrees pick up handout. pedigrees = “family trees” standard symbols
TRANSCRIPT
Get Handout
• “How to Construct a Human Pedigree”• The affected trait is usually shaded.• See the note:
N = normal• nn = not normal and is shaded
See HandoutN=Normal
n=not normal
• 1.How many children did parents II-3 and II-4 have?32. What is the sex of the oldest child of parents II-7 and II-8?Male3. What is the genotype of person I-1?nn because there are affected and not affected offspring
See HandoutN=Normal
n=not normal
• 4. What is the relationship of the person II-4 to the couple I-1 and I-2?
• Daughter-in-law
Label the generations and individualsoldest children are on the left
GENERATIONS: use Roman Numerals
Label the generations and individuals
I
II
III
1 2
1 2 3
1 2 3 4
EE and Ee are free lobes
ee is attached lobe
Label the generations and individuals
I
II
III
1 2
1 2 3
1 2 3 4
EE and Ee are free lobes
ee is attached lobe
ee
ee
EeEe
E-Ee
Ee Ee Ee
Your assignment:Constructing A Pedigree for Your Family
• 1. Choose one of the traits from the “Variations of a Human Face”
• 2. Construct at least 3 generations:• REQUIRED: Your parents, your grandparents,
and your brothers and sisters.• Extra Credit for aunts, uncles, and cousins.• 8 1/2 by 11 paper• Correct symbols DUE MAY 26
You cannot use:
• Eye color, hair color, skin color…these have polygenic traits and are too difficult to do with a simple pedigree
• That is why we are staying with the simple dominant – recessive traits of the activity “Variations of a Human Face”