Cross made between two parents considering one contrasting trait is called a
Monohybrid cross is a breeding experiment between parental generation organisms that differ in a single trait, such that the progeny formed is a hybrid for a single gene or character. For, example Mendel took the charcter “height” into consideration, and crossed tall (TT) and dwarf (tt) pea plants to study the inheritance of this gene. He obtained a progeny that is heterozygous tall (Tt), which is a hybrid for this single character, hence called a monohybrid.