Sweet pea has two white-flowered, but different in origin, the plants when crossed gave purple-flowered hybrids in F1.

Sweet pea has two white-flowered, but different in origin, the plants when crossed gave purple-flowered hybrids in F1. In F2 there are 9 plants with purple flowers and 7 with white ones. What offspring can be obtained from crossing two purple-flowered plants?

Offspring from crossing two purple-flowered plants can be:
a) only purple-flowered, if plants with genotypes are crossed: 1) AABB; 2) AABb and AaBB; 3) AABB and AaBB; 4) AABB and AABb; 5) AABB and AaBb;
b) purple-flowered and white-flowered (in a ratio of 3: 1), if plants with genotypes AaBb and AaBB or AaBb and AABb are crossed;
c) purple-flowered and white-flowered (in a ratio of 9: 7), if plants with genotypes AaBb are crossed.

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