1. Pedigree Charts and Sex-linked Traits Pg 61

2. Polygenic traits –
Traits that are controlled by more than 1 gene
Ex: height, weight, skin color, intelligence, behavior, etc.
Carrier – a person who carries a recessive gene for a disease, but does not show it. (heterozygous)

3. Pg 60
Listen to the song, and try to draw the pedigree chart that goes with it 

4. Pg 60
Copy this pedigree chart, and use it to figure out the family’s genotypes.

5. Notes pg 61 Sex-linked traits – carried on the X chromosome.
It is easier for a male to have an X-linked trait than for a female

6. Sex-linked Key X X – normal Female X Y – normal Male
X Xa – Carrier Female
Xa Xa – Female with the trait (disease)
Xa Y – Male with the trait (disease)
(males can NOT be carriers)

7. In flies, red eyes( R) is dominant over white eyes (r).
XRXr
XRXR
XRY
XrY
What would you get if you crossed a heterozygous red-eyed female with a red-eyed male?

8. If a female who is a carrier for color-blindness marries a normal male, what is the probability their children will be color-blind?