Definition of Robertson's law in US English:

Robertson's law

noun

Genetics
  • 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.

Origin

1930s; earliest use found in Proceedings of the Zoological Society of London. From the genitive of the name of William R. B. Robertson + law.

Pronunciation

Robertson's law

/ˈrɒbəts(ə)nz ˌlɔː/