Q.
Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parental of coupling type alongwith its cross over or repulsion
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AIPMTAIPMT 1990Principles of Inheritance and Variation
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Solution:
Bateson and Punnet explained that when two dominants enter from the same parent-they try to remain together, called coupling. When two dominants enter from different parents they try to remain seperate called repulsion. Bateson and Punnett (1906) used the term coupling and repulsion in sweet pea (Lathyrus odoratus) for linkage and crossing over. The correct parental of coupling type along with its cross over or repulsion is coupling AABB, aabb : Repulsion AAbb; aaBB.