Verification in Mice of the Possibility of more than Fifty per cent Recombination

EXTENSIVE data in Drosophila and maize show that the recombination fractions between two loci in the same chromosome increase at first nearly proportionally to the map distance, but tend for very high map distances to a limiting value, not exceeding 50 per cent. With other organisms only two cases of a greater apparent frequency seem to have been claimed, namely, a case reported by Wellensiek (1929 in Pisum, and one by Clausen (1926) in a Viola hybrid.