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03 - Mendel's second law MCB140 1"The offspring of hybrids...

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MCB140 01-28-08 1 Mendel’s second law
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MCB140 01-28-08 2 “The offspring of hybrids in which several differing traits are associated” “In the experiments above described plants were used which differed only on one essential character. The next task consisted in ascertaining whether the law of development discovered in these applied to each pair of differentiating characters when several diverse characters are united in the hybrid by crossing.” dihybrid cross
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MCB140 01-28-08 3 “Two experiments were made with a considerable number of plants. In the first experiment the parental plants differed in the form of the seed and in the color of the albumen; in the second in the form of the seed, in the color of the albumen, and in the color of the seed-coats. Experiments with seed characters give the result in the simplest and most certain way. In order to facilitate study of the data in these experiments, the different characters of the seed plant will be indicated by A , B , C , those of the pollen plant by a , b , c , and the hybrid forms of the characters by Aa , Bb , and Cc .”
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MCB140 01-28-08 4
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MCB140 01-28-08 5
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MCB140 01-28-08 6 Ta-daaa! The second law “There is therefore no doubt that for all of the traits involved in the experiments this statement is valid: the offspring of the hybrids in which several essentially different characters are combined exhibit the terms of a series of combinations, in which the developmental series for each pair of differentiating traits are combined.
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