One of the mysteries of the English language finally explained.
An empirical law stating that the number of chromosome arms of a population or species tends to remain constant, although the number of chromosomes may vary.
1930s; earliest use found in Proceedings of the Zoological Society of London. From the genitive of the name of William R. B. Robertson + law.
Robertson's law/ˈrɒbəts(ə)nz ˌlɔː/
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