Abstract
In this paper, an analysis on Nilsson-Ehle’s hybridization experiment in wheat was done by means of self-fertilization method along with the pericarp inheritance. It showed that because seeds of wheat were coated with 2n tissues of mother’s body, the grain colors were determined by mother’s genotype. The color of the F1 grains in this experiment was old red. The phenotypes of the F2 grains were uniformly medium red and did not segregate. Grains in the F3 generation segregated in the ratio 6 red (varying intensities of red) to 1 white with a definite probability respectively. This is the consequence of additive effect of 3 gene pairs and belongs to discrete distribution rather than continuous distribution. Therefore, the multiple-gene hypothesis based on this experiment cannot solve the continuous variations in inheritance of quantitative characters.
Highlights
In early 1900s Nilsson-Ehle conducted hybridization experiments in red seed variety and white seed variety in wheat
When red seed variety with 2 gene pairs was crossed with white seed variety in wheat, the variation in grain color was explained with the help of additive effect [7]
The segregation of the grain colors occurs in the third hybrid generation, which belongs to the delayed inheritance
Summary
In early 1900s Nilsson-Ehle conducted hybridization experiments in red seed variety and white seed variety in wheat. On the basis of this study, the famous multiple-gene hypothesis was founded and used to explain the continuity of quantitative characters by William Bateson, G. Udny Yule and other geneticists [1]. This hypothesis has become a classic theory of the inheritance of quantitative character [2] and has been popular so far over the world.
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