When a cluster of genes shows linkage behaviour,they:

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:

There are three genes $a, b, c$. The percentage of crossing over between $a$ and $b$ is $20\%$,between $b$ and $c$ is $28\%$,and between $a$ and $c$ is $8\%$. What is the sequence of genes on the chromosome?

The number of linkage groups in $E. coli$ is:

If interference is complete or $100\%$ then the frequency of observed double crossover will be:

Alleles of different genes that are on the same chromosome may occasionally be separated by a phenomenon known as