Question

Coupling and repulsion hypothesis was proposed by

Answer 1

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Normally if independent assortment takes place, we should expect 1:1:1:1 ratio in a testcross. Instead, 7:1:1:7 ratio was actually obtained, indicating that there was a tendency in dominant alleles to remain together. Similar was the case with recessive alleles. This deviation was, therefore, explained as gametic coupling by Bateson. Similarly, it was observed that when two such dominant alleles or two recessive alleles come from different parents, they tend to remain separate. This was called gametic repulsion.

In Bateson's experiment in repulsion phase, one parent would have blue flowers and round pollen (BBll) and the other would have red flowers and long pollen (bbLL). The results of a testcross in such a repulsion phase were similar to those obtained in coupling phase giving 1:7:7:1 ratio instead of expected 1:1:1:1. Bateson explained the lack of independent assortment in the above experiments by means of a hypothesis known as coupling and repulsion hypothesis. Although coupling and repulsion as explained above were later discovered to be the two aspects of the same phenomenon called linkage, the terms coupling phase and repulsion phase are still considered to be useful terms in scientific literature.

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