In his experiments on pea plants, Mendel was unable to explain which of the following?

In the mid-1800s, Gregor Mendel, the father of modern genetics, conducted his famous experiments using garden pea plants and discovered the principles of genetic inheritance. However, because chromosomes and their role in inheritance were not known at the time, Mendel was unable to explain their role in his work. The relationship between chromosomes and genetics was not fully understood until the early twentieth century.