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By David T Suzuki

This can be a revision of the genetics textual content, thoroughly up to date and reorganized to mirror the speedy developments within the genetics box. The fourth variation simplifies the presentation of adverse options with no compromising the text's clinical integrity

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Crosses of plants differing in one character Figure 2-3 One of the techniques of artificial cross-pollination, demonstrated with the Mimulus guttatus, the yellow monkey flower. To transfer pollen, the experimenter touches anthers from the male parent to the stigma of an emasculated flower, which acts as the female parent. ] or experimenter can cross any two pea plants at will. The anthers from one plant are removed before they have shed their pollen, preventing selfing. Pollen from the other plant is then transferred to the receptive stigma with a paintbrush or on anthers themselves (Figure 2-3).

He observed that, in the pods of the F1 plants, three-fourths of the F2 peas were yellow and one-fourth were green: F1 F2 all yellow (self ) Ά 3 4 1 4 yellow green The ratio in the F2 is simply the 3 : 1 phenotypic ratio that we encountered earlier. To further test the members of the F2, Mendel selfed many individual plants. He took a sample consisting of 519 yellow F2 peas and grew plants from them. These yellow-pea F2 plants were selfed individually, and the colors of peas that developed on them were noted.

Are reciprocal crosses. Mendel made a reciprocal cross in which he pollinated a white flower with pollen from a purple-flowered plant. This reciprocal cross produced the same result (all purple flowers) in the F1 as the original cross had (Figure 2-6). He concluded that it makes no difference which way the cross is made. If one purebreeding parent is purple-flowered and the other is white-flowered, all plants in the F1 have purple flowers. The purple flower color in the F1 generation is identical with that in the purple-flowered parental plants.

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