Abstract
Experimental populations were established with individuals with and without B chromosomes at different frequencies. Two species were used: the cross-pollinating Secale cereale, naturally carrying B chromosomes, and the self-pollinating S. vavilovii in which Bs were introduced artificially. The plants were allowed to fertilise by open pollination and the offspring produced were studied for the distribution of B chromosomes over several successive generations. In S. cereale the equilibrium polymorphism was reached in only one generation. The mean number of Bs per plant and their distribution was different depending on the initial frequency of Bs in the established populations. In S. vavilovii, plants with many Bs were formed because of its mating system, which did not allow an equilibrium to be reached in one generation. The existence of equilibrium polymorphism for Bs in populations with a percentage of self-pollination is discussed.
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Puertas, M., Ramirez, A. & Baeza, F. The transmission of B chromosomes in Secale cereale and Secale vavilovii populations. II. Dynamics of populations. Heredity 58, 81–85 (1987). https://doi.org/10.1038/hdy.1987.12
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DOI: https://doi.org/10.1038/hdy.1987.12
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