Do you think Mendel's laws of inheritance would have been different if the characters that he chose were located on the same chromosome?

Which of the following is true about linkage?
$I.$ It is a phenomenon in which more recombinants are produced in $F_{2}$-generation.
$II.$ More parental combinations are produced in $F_{2}$-generation.
$III.$ Genotypes which are present in $F_{1}$ hybrid reappear in high frequency in $F_{2}$-generation.
$IV.$ It is a phenomenon in which two chromosomes are linked.

In $Neurospora$,the arrangement of $8$ ascospores produced is $2a : 4a : 2a$. This indicates:

Drosophila melanogaster has $8$ chromosomes in its somatic cell. How many linkage groups will it have?

Thomas Hunt Morgan was awarded the Nobel Prize for his work on:

Mendel observed that some traits do not assort independently. Later research showed that this is due to .....