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• W2149017651 startingPage "433" @default.
• W2149017651 abstract "some. ROMAN (1947, 1948), ROMAN and ULLSTRUP (1951), BELLINI, BIANCHI and OTTAVIANO (1961 ) , and BIANCHI, BELLINI, CONTIN and OTTAVIANO ( 1961 ) have described the behavior of such translocations when they are transmitted through the pollen. In the mitotic division of the generative nucleus to form the two sperm nuclei, the BA member of these translocations frequently undergoes nondisjunction resulting in one sperm with two BA elements (duplicate or hyperploid) and one sperm vvith no BA (deficient or hypoploid). Fertilizations involving pollen grains in which non-disjunction has occurred will produce two classes of seed. One class will result from the fertilization of the polar fusion nucleus by the hyperploid sperm and the egg nucleus by the hypoploid sperm. Such a seed will have two BA elements in the endosperm and none in the embryo. The second class will result from the hypoploid sperm nucleus fertilizing the polar fusion nucleus and the hyperploid sperm fertilizing the egg nucleus. The resulting seed will have no BPL chromosomes in the endosperm and two BA chromosomes in the embryo. Both of the above classes will receive the AB element of the translocation. This study is primarily concerned with an analysis of crossing over involving the BA element and its transmission through the female gametophyte. MATERIALS AND METHODS The translocation which was used, TB-Pb, has the distal 60% of the short arm of chromosome 9 transferred to a B chromosome (ROMAN and ULLSTRUP 1951). This segment includes ygr (yellow-green plant), c (colorless aleurone), sh, (shrunken seed), and other loci. The wx (waxy endosperm) locus is proximal to the break point. Figure la shows the probable break point in chromosome 9. This study began with hyperploid plants of the constitution 9 gBB9B9 in which the normal chromosome 9 carried the recessive genes c, sh,, and wz, the B9 chromosome carried dominant genes C (colored aleurone) and Sh, (plump seed), and the gB chromosome carried Wx (starchy seed). The genotype was thus CC c, Sh, Sh, sh,, Wx wx (Figure lb). These hyperploid plants were obtained originally by selecting colorless shrunken seeds from ears of a c c sh, sh, wx wx pollinated by a TBBb homozygous for the dominant alleles. The hyperploid plants were pollinated by a ''c tester stock (a c c line that is homozygous for all of the other genes necessary for colored aleurone) of the constitution c c sh, sh, wx wx. To determine the chromo' Journal Paper No. 5.5493 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 1381." @default.
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• W2149017651 date "1967-03-15" @default.
• W2149017651 modified "2023-09-23" @default.
• W2149017651 title "CROSSING OVER AND CHROMOSOMAL SEGREGATION INVOLVING THE B9 ELEMENT OF THE A-B TRANSLOCATION <i>B-9b</i> IN MAIZE" @default.
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• W2149017651 doi "https://doi.org/10.1093/genetics/55.3.433" @default.
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