The contrasting characters Mendel selected were:
1. Length of the stem: Tall/ Short
2. Position of flowers: Axial/ Apical
3. Shape of the seed: Rounded/ Wrinkled
4. Colour of fruit: Green/ Yellow
5. Colour of the carpel: Coloured/ White
6. Colour of the cotyledon: Yellow/ Green
7. Shape of the matured fruit: Swollen/ Wrinkled
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