Sex of Reciprocal Hybrids between the Hamakita (XX-XY Type) Population and the Murakami (ZW-ZZ Type) Population of Rana rugosa
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概要
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In Rana rugosa, sex chromosomes differed from populations to populations. The northern populations in eastern Japan were of the ZW-ZZ type, while the southern populations were of the XX-XY type. In these populations, chromosome pair No. 7 was always sex chromosomes. The X and W chromosomes were metacentric, while the Y and Z chromosomes were either subtelo- or submetacentric. The X and Y chromosomes were distinguished from the W and Z chromosomes, respectively, by the C-banding and LR (late replication)-banding patterns. In the present study, eight females of the XX type and eight males of the XY-type belonging to the populations of the southern subgroup collected from Hamakita, Shizuoka Prefecture, and six females of the ZW type and seven males of the ZZ type belonging to the populations of the northern subgroup collected from Murakami, Niigata Prefecture, were used to produce reciprocal hybrids in order to examine the relationship between sex chromosomes and sex. It was found that 330 mature offspring produced from matings between females (XX) of the Hamakita population and males (ZZ) of the Murakami population were all of the XZ type in sex chromosomes. There were 175 (53.0%) females and 155 (47.0%) males. In contrast, of the 258 mature offspring produced from matings between females (ZW) of the Murakami population and males (XY) of the Hamakita population, 157 and 101 (39.1%) were females and males, respectively. Of these offspring, 140 females and 87 males were examined with regard to sex-chromosome constitution. It was found that 65 were females of the WX type and 56 were males of the ZY type. While 57 were of the WY type, 55 (96.5%) were females and the other two (3.5%) were males. Of the remaining 49 which were of the ZX type, 20 (40.8%) were females and the other 29 (59.2%) were males. These results suggested that the female-determining genes on the W chromosome of the Murakami population were more dominant than the male-determining genes on the Z chromosome of the Murakami population as well as the male-determining genes on the Y chromosome of the Hamakita population. There was clearly no difference in strength between the male-determining genes situated on the Z chromosome of the Murakami population and the female-determining genes situated on the X chromosome of the Hamakita population, because males and females were nearly the same in number on the average, when chromosome pair No. 7 was ZX chromosomes, although there was usually a difference in number between males and females. It was found, moreover, that the male-determining genes situated on the Y chromosome of the Hamakita population were more dominant than the female-determining genes situated on the X chromosome. While the female-determining genes situated on the W chromosome of the Murakami population were absolutely dominant, the male-determining genes situated on the Y chromosome of the Hamakita population were slightly more dominant than the male-determining genes situated on the Z chromosome of the Murakami population.
- 広島大学の論文
著者
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Hanada Hideki
Laboratory For Amphibian Biology Faculty Of Science Hiroshima University
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NISHIOKA Midori
Laboratory for Amphibian Biology, Faculty of Science, Hiroshima University
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Nishioka Midori
Laboratory For Amphibian Biology Faculty Of Science Hiroshima University
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