Correlated chromosome aberrations at meiosis in Gasteria

Summary

• 1. Misdivision of the centromere and terminal and intercalary unions of chromatids occur spontaneously at meiosis in a plant ofGasteria undulata.

• 2. Both these errors are confined to long chromosomes and the chromatid errors to the long arms of long chromosomes.

• 3. Thus the centromere interferes with the chromatid errors. Yet this and previous accounts indicate that centric errors and chromatid errors are basically connected.

• 4. The misdivision gives new isochromosomes at meiosis and new telocentric fragments which act as complementary chromosomes at the pollen grain mitosis and can thus change the basic number.