More Patterns of Inheritance. Incomplete Dominance. A cross where neither allele is dominant over the other. The traits appear to be blended together. Ex. Snapdragon flowers RR=Red WW=white RW=pink. Bay is brown with black . . The Cream Dilution Gene Is white when homozygous.
The Cream Dilution Gene
Is white when homozygous.
What will it do to horses?
CREAM and BROWN
New color: BUCKSKIN
Does this show?
Cream dilutes red-brown
Q: Cross FB FB and FW FW and what will be produced?
A: A Steel Blue
Chicken FB FW
2. A farmer is planning to mate a bull and cow. The male has a roan coat (brown and white hairs) and the female has a white coat (white hairs). What might their calves look like?
3. Your parents have decided to plant some snapdragons and want to know why there are three colors – red, pink and white.
You volunteer to explain it to them by showing them the cross of 2 hybrid pink snap dragons – what are the possible offspring?
What are your chances of having a baby with sickle cell anemia?
Use RR for normal blood. RS for carriers and SS for sickle cell anemia.
F = free ear lobes
ff = attached ear lobes
Normal male- XB Y
Affected Male- Xb Y
Normal Female – XB XB
“Carrier” Female – XB Xb
Affected Female – Xb Xb
A male with the XbY will have the recessive trait for baldness.
Hemophilia (lethal and sex-linked)
bleed to death
Huntington’s disease- brain shrinks