Question

Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parental or coupling type along with its cross over or repulsion.

A) Coupling AABB, aabb ; Repulsion AABB, AAbb

B) Coupling AAbb, aaBB ; Repulsion AaBb, aabb

C) Coupling aaBB, aabb ; Repulsion AABB, aabb

D) Coupling AABB, aabb ; Repulsion AAbb, aaBB

Answer 1

Option D is right.

Coupling is when 2 dominant alleles are present in the same chromosome. Repulsion is when two alleles of different parents tend to enter different gametes.
Hence parental cross for coupling will be AABB X aabb and parental cross for repulsion will be AAbb X aaBB