Primary source of allelic variation is

Linked genes show.....

Crossing over is advantageous because it brings about

What will be the number of linkage groups in maize if it has $10$ pairs of chromosomes?

Genes $p, q,$ and $r$ are arranged on a chromosome. If the recombination frequency between $p$ and $q$ is $10 \%$,the recombination frequency between $q$ and $r$ is $20 \%$,and the recombination frequency between $p$ and $r$ is $10 \%$,what is the order of the genes on the chromosome?

How many linkage groups are present in bacteria?