Sex determination in humans happens through sex chromosomes. Along with other parameters, such processes often help in forensic studies in crime investigation and / or identification of accidents and natural calamities. In order to determine whether an accident victim is male or female, which cells can be used and why?

Seema learned the chapter heredity and evolution in her school. She was so interested in the topic that she crossed pure breed pea plants having round-yellow seeds with wrinkled green seeds to see what happens. Seema found that only A-B type of seeds was produced in the F1 generation. Later when she crossed F1 generation pea plants having A-B type of seeds by self-pollination, then in addition to the original round yellow and wrinkled green seeds, two new varieties A-D and C-B types of seeds were also obtained.

Which one of these will be produced in maximum number in the F2 generation?