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An inbred strain of plants has a mean height of 20 cm. a second inbred strain also has a height of 40 cm. crossing the two strains produces an f 1 that has a mean height of 30 cm. the f 2 have a continuous range of heights was observed with most plants around 30 cm and 1 out of 1000 at 20-cm, and 1 out of 1000 at 40 cm. how much does each additive allele contribute to height

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