Table 2.

Cytological Screen of Kernels from Crosses Involving 9Bic-1

Chromosome Constitutiona	Total	20 A Chromosomes	19A + 1 9Bic-1	19A	19A + 2 9Bic-1	19A+ 1 9Bic-1 + 1 Tiny Fragment	19A + 1 9L Fragment
Kernel phenotype
Cross 1: ♀ c1/c1 × ♂ 9(C1)/9Bic-1(C1) + 2B
Colored embyro, colorless endosperm	54	0	45	0	7	2	0
Colorless embryo, colored endospermb	28	18	2	5	0	0	3
Colored embryo, mosiac endosperm	29	0	24	0	2	3	0
Both colored	33	18	14	0	0	1c	0
Random (mix of all above)	40	16	22	0	0	1	1
Cross 1: ♀ 9(C1)/9Bic-1(C1) + 2B × ♂ c1/c1
Both colored	101	50	51	0	0	0	0

A sampling of kernels from reciprocal crosses involving the c1 tester and 9(C1)/9Bic-1(C1) + 2B were germinated and the chromosome constitution examined.

^aThe presence or absence of intact B chromosomes was not scored. When present, there were always two B chromosomes.

^bIt is not possible to identify this kernel type with accuracy in this background. Misclassified kernels explain the recovery of plants with a standard chromosome 9.

^cThe presence of a tiny chromosome in a single kernel of this phenotype is the only case that can not be explained via chromosome breakage.