Mendel believed that during the formation of gametes, the pair of genes controlling a trait separate. He called this the principle of _____.
a. dominance
b. segregation
c. separation
d. recession

Respuesta :

B. Segregation. 
I have the same question and answered it and this is what it told me. I think it should be right. 

Answer:

Mendel believed that during the formation of gametes, the pair of genes controlling a trait separately. He called this the principle of _____.

a. dominance

b. segregation

c. separation

d. recession