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

For the physical association of genes on a chromosome,Morgan coined the term $...............$ and for the generation of non-parental gene combinations,he described the term $...............$.

Mendel was successful in discovering the principles of inheritance because:

Define/Explain the following terms:
$1.$ Linked genes
$2.$ Locus

Drosophila has four pairs of chromosomes. How many linkage groups does it have?

Mendel observed that some characters did not assort independently. Later researchers found it to be due to