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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

A

`1:1`

B

`3:1`

C

`1:1:1:1`

D

`9:3:3:1`

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The correct Answer is:
B
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