Sex chromosome differentiation in the Japanese brown frog, Rena japonica II. Sex-linking analyses of the nucleolar organizer regions in chromosomes No.4 of the Hiroshima and Saeki populations
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概要
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The Wakuya population of the Japanese brown frog, Rana japonica, from Miyagi Prefecture (northeast of Honshu, Japan) is characterized by ♂XY/♀XX sex chromosomes. The sex chromosomes are the fourth largest(No. 4) in the complement ; the Y chromosome is distinguished from the X and autosomes by its C- and late replication banding patterns. In the present study, somatic chromosomes of this species were examined with two populations from Hiroshima and Saeki of Hiroshima Prefecture (southwest of Honshu) by C-, late replication and Ag-banding techniques, with special attention to chromosome No. 4. However, sex-related differences in shape and banding pattern were not found in any chromosomes, inclusive of No. 4. Since nucleolar organizer regions (NORs) were present in chromosome pair 4 in one of the two populations, linkage of the NOR in chromosome No. 4 to the sex was examined in the backcrossed offspring between these two populations. As a result, the NOR in chromosome No. 4 was not linked to the sex. Therefore, a male determining gene may not be on chromosome No. 4 in these two populations of Hiroshima Prefecture.
- 1994-12-15
著者
関連論文
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- Sex chromosome differentiation in the Japanese brown frog, Rena japonica II. Sex-linking analyses of the nucleolar organizer regions in chromosomes No.4 of the Hiroshima and Saeki populations
- Sex chromosome differentiation in the Japanese brown frog, Rana japonica. I.Sex-related heteromorphism of the distribution pattern of constitutive heterochromatin in chromosome no.4 of the Wakuya population
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