When closely placed genes on the same chromosome are inherited together,the phenomenon is known as:

The coupling and repulsion theory was proposed by:

Crossing over is advantageous because it brings about

Who coined the term 'linkage'?

Complete linkage is observed in.....

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$:
Mendel's law of independent assortment does not hold good for the genes that are located closely on the same chromosome.
Reason $(R)$:
Closely located genes assort independently.
In the light of the above statements,choose the correct answer from the options given below: