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Mendel made reciprocal crosses. In most plants,
any cross can be made in two ways, depending on which phenotype is used as male (♂) or female
(♀). For example, the following two crosses
are reciprocal crosses. Mendel’s reciprocal cross in which he pollinated a white flower with
pollen from a purple-flowered plant produced the same result (all purple flowers) in the
F1 (Figure 2-5 ). He concluded that it
makes no difference which way the cross is made. If one pure-breeding 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. In this case, the inheritance is not a
simple blending of purple and white colors to produce some intermediate color. To maintain a
theory of blending inheritance, we would have to assume that the purple color is somehow
“stronger” than the white color and completely overwhelms any trace of the white phenotype in
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Jun 16th, 2015
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