ABSTRACT
Recombination and randomness The combination rule is confined by the strange phenomenon that Morgan calls crossing-over or the exchange of genes, which he imagines as a real exchange of parts between the chromosomes. … A German scientist has appropriately compared this to the astronomical calculation of celestial bodies still unseen but later on found by the tube-but he adds: Morgan’s predictions exceed this by far, because they mean something principally new, something that has not been observed before.
