" He selected seven contrasting pairs of characters or traits in a garden pea. These include round/wrinkled seeds, tall/short plants, green/yellow pod colour, purple/white flower colour, axial/terminal flower, green/yellow pod colour, and inflated/pinched ripe pods".
Green/yellow pod colour is repeated , so there will be 6 characters?

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Solution

Seven traits taken by Mendel were round/wrinkled seeds, purple/white flower colour, inflated/pinched ripe pods, green/yellow pod colour, axial/terminal flower, tall/short plants, yellow/green colour cotyledon. Green/yellow pod colour is not repeated. As the seventh character taken by Mendel was Yellow/green cotyledon colour.

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