doi: 10.1093/oxfordjournals.jhered.a103028pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
doi: 10.1093/oxfordjournals.jhered.a103027pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
doi: 10.1093/oxfordjournals.jhered.a103029pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
doi: 10.1093/oxfordjournals.jhered.a103030pmid: N/A
Abstract 1. A fourth gene for the tassel seed type of plant has been discovered in maize and designated ts4. 2. Tassel seed-4 behaves as a simple Mendelian recessive to the normal maize plant. 3. Linkage tests indicate that T s4ts4 is probably inherited independently of the Pr pr, Y y, B b and V2v2 factor pairs. 4. A slight indication of linkage exists beteween Ts4ts4 and the A a factor pair for Anthocyanin pigment but the evidence is not conclusive. The data fit an hypothesis of 44.8 per cent crossing-over. This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
doi: 10.1093/oxfordjournals.jhered.a103031pmid: N/A
Abstract 1. The number of persons in the United States with an intelligence quotient of less than 70, and therefore seriously deficient in intellect, appears to be not less than 4%. 2. About 4% of the population will also be patients at sone time during life of a hospital for mental diseases. Others equally in need of such hospitalization will not receive it, but their unknown number should be added to the 4% mentioned in taking a national inventory of the amount of damaged germ-plasm. 3. When these two groups, the mentally diseased, are added together (there is not much overlapping). the total number of persons who are definitely subject to mental diseases of a serious nature or are intellectually retarded to a serious degree must he nearly 10,000,000. 4. Many of this number owe their condition to heredity, and the question of eugenic sterilization may, therefore, arise in connection with them at some time. 5. The number of persons carrying inheritable physical defects or dispositions of a serious nature is even larger than that carrying the more severe forms of mental abnormalities. In the number are the small groups of blind, deaf, crippled, and the like, and the large groups characterized by degenerative conditions of the heart, arteries. or kidneys, and by such diseases as tuberculosis and cancer. 6. While the groups with mental defects furnish a11 the cases of compulsory sterilization, the groups with physical defects appear to furnish most of the cases of voluntary sterilization in California. 7. In view of the great numbers of affected persons, it is concluded that the state must take an immediate and active interest in voluntary as well as in compulsory sterilization. This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
doi: 10.1093/oxfordjournals.jhered.a103032pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
doi: 10.1093/oxfordjournals.jhered.a103033pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
doi: 10.1093/oxfordjournals.jhered.a103034pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
doi: 10.1093/oxfordjournals.jhered.a103035pmid: N/A
Abstract A survey of the available literature indicates that commercial varieties of figs in Eurasia have originated as chance seedlings. While some, attempts at systematic fig breeding have been made. no records of marked improvement in varieties have been noted as a result of such breeding. Numerous attempts to produce better parthenocarpic varieties in the southern United States have also largely shown discouraging results. While thousands of fig seedlings of three types, common, Smyrna, and caprifigs, have been grown and distributed in California during the past four decades, none have so far become established commercially, although several have valuable characteristics. The desirability of developing improved fig varieties by breeding, however, is still recognized in California. Both the United States Department of Agriculture and the California Experiment Station are growing numerous fig seedlings in the hope of finding a white variety as good as the Black Mission, a good Smyrna fig resistant to splitting, common figs immune to souring, and improved varieties of caprifigs. This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
doi: 10.1093/oxfordjournals.jhered.a103036pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1928 AMERICAN GENETIC ASSOCIATION
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