Explain the inheritance of two genes' in pea plants with two suitable examples.

Explanation

It is a cross between two plants differing in 2 pairs of contrasting characters. Meadel selected shape of the seed and colour of the cotyledons as the two pairs of contrasting characters. Round seed coat is dominant over wrinkled seed coat and yellow colour of cotyledon is dominant over the green colour.
Mendel crossed a pure breeding garden pea plant producing round and yellow seeds with a pure breeding garden pea plant producing wrinkled and green seeds.
Phenotype of Round seed coat Wrinkled seed coat

Round seed coat and yellow cotyledons=9
Wrinkled seed coat and yellow cotyledons=3
Round seed coat and green cotyledons=3
Wrinkled seed coat and green cotyledons=1
Genotypype ratio: 1:2:3:4:1:2:1:2:1
Thus in the `F_(2)` ge generation, he go tyellow round, yellow wrinkled, green round and green wrinkled in the nationn of 9:3:3:1, respectively.