I was reading Genetic Analysis (Sanders, Bowman) and saw the following figure summarizing the 1909 work of Herman Nilsson-Ehle in describing the genetic control of kernel color in wheat:

Figure 21.1, pg. 711 in 2012 ed.

How did Nilsson-Ehle determine that the original pure-breeding parents were in fact homozygous for each allele?

  • $\begingroup$ Welcome to Biology.SE. They were probably inbred lines for many generations. $\endgroup$ – Remi.b Aug 1 '16 at 18:10

If they are "pure-breeding", that means that they are homozygous. If they were heterozygous, the offspring would not all have the same color as the parents. But tree-breeding" means they all do.

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  • $\begingroup$ These genes are additive. No dominance relationship is assumed to exist between allele $A_1$ and $A_2$ or between allele $B_1$ and $B_2$. $\endgroup$ – Joshua Gray Aug 2 '16 at 19:53

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