Difference Between Monohybrid and Dihybrid

Mendel's earlier experiments in garden pea (Pisum sativum) were mono hybrid crosses. A cross involving contrasting expression of one trait is transferred to as monohybrid cross. For example, in order to learn inheritance of plant height, a tall pea plant was crossed with a dwarf one; all other traits were ignored.
Monohybrid cross
Inheritance of two pairs of alleles through a number of generations was studied by Mendel through dihybrid crosses. In one experiment Mendel crossed a round green’ with a wrinkled yellow. The F1 individuals, called dihybrid, were all round yellow. Two members of the F1 were crossed to raise the F2 . The result was 315 round yellow + 108 round green + 101 wrinkled yellow +  32 wrinkled green. This observed figures closely approximated a 9:3:3:1 ratio.
Dihybrid cross
Monohybrid vs Dihybrid
 It is a cross between two pure organisms in order to study the inheritance of a single pair of alleles.
 It is a cross between two pure organisms of a species in order to study the inheritance of two pairs of alleles belonging to two different characters.
 It produces  a phenotypic monohybrid ratio of 3:1 in F2 generation.
 It produces a phenotypic dihybrid ratio of 9:3:3:1 in F2 generation.
 It produces genotypic ratio of 1:2:1 in F2.
 It produces genotypic ratio of 1:2:1:2:4:2:1:2:1
 Test cross ratio - 1:1
 Test cross ratio -1:1:1:1

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