The B Chromosome of Corn

INTRODUCTION ........ ........ . . . . .. . . . . ...... ... 5 PROCESSES CONTROLLED BY THE B CHROMOSOME ........ . .. .. ....... ... 8 Nondisjunction 8 Preferential Fertilization , . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . ,. . . . . . . . . . . . ....... 11 Recombination 12 MOLECULAR AND CELLULAR BIOLOGY . . . . . 13 RELATIONSHIP TO ABNORMAL CHROMOSOME 10 IS APPLICATION OF B CHROMOSOME NONDISJUNCTION TO GENETIC STUDIES 16 Chromosome Mapping 16 Transfer of A Chromosome Segments Between Lines .. 16 Gene Dosage and Gene Imprinling Studies 17 SUMMARY ..... . . . . .. ......... ... . ....... 18