MonoHybrid- It is a cross between 2 indivisual having one pair of contrasting trait. e.g. Aa with Aa
Diyhybrif- IT is cross between 2 indivisual having one pair of same allel e.g TT with tt
Test cross- It is cross between f1 generation and one of the parents(recessive )
back cross-Backcrossing is a crossing of a hybrid with one of its parents or an individual genetically similar to its parent, in order to achieve offspring with a genetic identity which is closer to that of the parent.