. Cytological and genetic studies of sterility in inbred and hybrid maize. Sterility in plants; Corn; Corn; Hybrid corn; Hybrid corn. Sterility In lvl>i'Cil (ind riijhrid Maize 715 Tablk 7. Progeny of Plants Heterozygous for Inversion on Chromosome 1. No. of plants No of semi- Percent with Type of cross witho Lit inversion sterile plants Total inversion Hybrid ear open-polinatec 4-8 X R4 11 s' 19 540 X 4-8 22 18' 40 187-2 X 4-8A 15 14^ 29 Iowa Hybrid 13 22 3 25 Selfed ears from 187-2 X 4-8A 2 15^ 17 10 6 16 5 7 12 3 9 12 Heterozygous inversion X or on
. Cytological and genetic studies of sterility in inbred and hybrid maize. Sterility in plants; Corn; Corn; Hybrid corn; Hybrid corn. Sterility In lvl>i'Cil (ind riijhrid Maize 715 Tablk 7. Progeny of Plants Heterozygous for Inversion on Chromosome 1. No. of plants No of semi- Percent with Type of cross witho Lit inversion sterile plants Total inversion Hybrid ear open-polinatec 4-8 X R4 11 s' 19 540 X 4-8 22 18' 40 187-2 X 4-8A 15 14^ 29 Iowa Hybrid 13 22 3 25 Selfed ears from 187-2 X 4-8A 2 15^ 17 10 6 16 5 7 12 3 9 12 Heterozygous inversion X or on normal 11 8 19 14 7 21 8 11 19 Totals 123 106 229 1 One plant examined cytologically. 2 Two plants examined cytologically. in a cross with a normal stock, one-lialf the resulting progeny should be heterozygous for the inversion and one-half should have normal chromosomes. When any of these three tyi^es of crosses is made, there should be one-half the progeny with normal pollen and one-half the progeny with pollen segregating aborted grains, the latter represent- ing plants heterozygous for the inversion. Ears of most plants lieterozygous for this inversion are recognizable as semi-sterile. Trans- mission of the inversion was tested by making the crosses described above. The data are given in Table 7. Classitications were based on. Figure 4. Outline drawing of the synapsis at mid- prophase of meiosis in a plant heteroz5'-gous for a trans- location between chromosomes 1 and 2. An inbred (696-3c) was found to be homozygous for the translo- cation. Chromosome 1 has prominent chromomeres at the end of the short arm and a heterozygous knob on the short arm. Chromosome 2 has a homozygous knob on the long arm. Plant 38-1210-8 (Pedigree 696-3c X Pamunkey).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origina
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