The number of linkage groups in a cell having $10$ pairs of chromosomes is.....

When two genes are situated very close to each other in a chromosome,

What map unit (Centimorgan) is adopted in the construction of genetic maps?

The linkage map of a fruit fly has a total map distance of $66$ units. The gene for yellow body $(a)$ is at one end and the gene for short hair $(y)$ is at the other end. What will be the recombination frequency between these two genes $(a$ and $y)$?

The term "linkage" was coined by

What is the reason for the absence of hybrids?