Explain with an example the inheritance of dihybrid cross.How is it different from monohybrid cross?

Explanation

Mendel crossd pea plants having round yellow seeds (dominant) with pea plants having wrinkled green seeds. In `F_(1)` generation, round shape, yellow colour of the seeds were dominant over the wrinkled green colour seeds. When the hybrids of `F_(1)` generation were cross-bred by self-pollination, the dihybrid cross, produced four types of `F_(2)` offsprings in the ratio of 9, with two dominant traits, 3 with one dominant trait and one recessive trait, 3 with another dominant trait and another recessive trait and 1 with two recessive traits.
Two new combinations of traits with round green and wrinkled yellow had appeared in the dihybrid cross. [`F_(2)` generation]
Mendel.s law of heredity:
(i) Law of dominance:
When two homozygous individuals with contrasting characters are crossed, the charaters, that appear in the `F_(1)` hybrid are dominant and those do not appear in `F_(1)` are recessive characters.
(ii) Law of segregation of Law of purity of gametes:
When a pair of contrasting factors or genes are brought together, in a heterozygote the contrasting pair remain together without, mixing and when gametes are formed, the two separate out, so that only one enters each gamete.
(iii) Law of Independent Assortment:
In case of inheritance of two or more pairs of characters simultaneously, the factors or genes of one pair assort out independently of the other pair.