Pedigrees Pick up Handout. Pedigrees = “Family Trees” Standard Symbols.

PedigreesPick up Handout

Pedigrees = “Family Trees”Standard Symbols

Blue people of KentuckyB=Normal b=methemoglonemia

Royals of Europe: hemophilia

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

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”

If you are adopted or are not able to determine a relative…

OK to make lines longer to fit people on the chart

See how you make a bracket when crossing lines

Can we say “Marriage Counseling?”