JK

Question 1

Amorphic Jk null

Answer 1

Very rare, more common in Polynesians and Finnish
When immunized readily makes anti-Jk3
Resists 2M urea

Question 2

Suppressor In(Jk)

Answer 2

Dominant inhibitor
Japanese families
Traces of Jka, Jkb, and Jk3
Not readily lysed by 2M urea 
Do not make anti-Jk3

Question 3

Gene

Answer 3

JK: Chromosome 18

Question 4

Gene function

Answer 4

Urea transporter