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Your search keyword '"Ikeuchi, Tatsuro"' showing total 27 results
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13. Chromosome studies in early embryogenesis

Author

Sasaki, Motomichi, Ikeuchi, Tatsuro, Obara, Yoshitaka, Hayata, Isamu, Mori, Michiko, and Kohno, Sei-Ichi

Abstract

Chromosome studies were made on 520 induced abortuses randomly collected in Sapporo. The mean gestational age was 9.6 ± 2.0 weeks after the first day of the last menstrual period, and the mean maternal age was 26.6 ± 5.8 years. There were 2 cases of X monosomy and 3 cases of autosomal trisomies for C, D, and E chromosomes, respectively. In addition, 12 males with an unusually long Y chromosome, 6 cases with an enlarged short arm or satellite in one of acrocentrics, and 1 each case with a heteromorphic pair of either No. 1 or 16 were found. A high incidence (10 to 42 per cent) of chromosome breakage was noted in 9 cases. Tetraploid cells were frequently observed in 6 cases (5.5 to 16.3 per cent). The sex ratio was 95.4 (XX + X : XY = 266 : 254), showing a slight excess of females over males, though a tendency was shown that the younger the embryonic age the lower the sex ratio.

Published
1971
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