The coupling and repulsion theory of Bat...

The coupling and repulsion theory of Bateson and Punnett later on modified linkage and crossing over by Morgan. Two completely linked genes show a dihybrid ratio of

`1 : 1`

`3 : 1`

`1 : 1 : 1 : 1`

`9 : 3 : 3 : 1`

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