Character choosen by Mendel are located on how many chromosome

If somatic cells of a human male contain single barrbody, the genetic composition of the person would be

In maize chromosome number is $2n = 20$. The number of linkage groups in it shall be

In Drosophila, the sex is determined by

A black hybrid mouse is crossed with a pure brown mouse to produce a total of $24$ young ones. Which of the following result is most likely to be correct