منابع مشابه
Sex determination: the amphibian models.
We review and discuss current knowledge about sex determination in amphibians. The astonishing wide variety of mechanisms of genotypic sex determination is presented and discussed in an evolutionary context. We recall the natural occurrence of transitory juvenile hermaphroditism in some species. Our present knowledge of the mechanisms of sex determination in amphibians is compared to that in ma...
متن کاملSex determination: genetic models for oysters.
In oysters, sex is determined partly by environment, but previous studies employing controlled crosses suggest that genetic factors are also important. Sex ratios in both full- and half-sib families of the Pacific oyster show paternal control of sex ratio and suggest that a single major gene with 2 genotypes controls sex in the Pacific oyster, with FM oysters being male and FF oysters maturing ...
متن کاملCytogenetic Insights into the Evolution of Chromosomes and Sex Determination Reveal Striking Homology of Turtle Sex Chromosomes to Amphibian Autosomes.
Turtle karyotypes are highly conserved compared to other vertebrates; yet, variation in diploid number (2n = 26-68) reflects profound genomic reorganization, which correlates with evolutionary turnovers in sex determination. We evaluate the published literature and newly collected comparative cytogenetic data (G- and C-banding, 18S-NOR, and telomere-FISH mapping) from 13 species spanning 2n = 2...
متن کاملParticipation of androgen and its receptor in sex determination of an amphibian species
INTRODUCTION In the Japanese frog Rana (R.) rugosa the androgen receptor (AR) gene on the W chromosome (W-AR) is barely expressed. Previously we showed that incomplete female-to-male sex-reversal occurred in Z-AR transgenic female frogs. To date, however, there is no report showing that AR with androgens can determine genetically programed male sex fate in any vertebrate species. Here, we exami...
متن کاملInvolvement of Androgen Receptor in Sex Determination in an Amphibian Species
In mice and humans, the androgen receptor (AR) gene, located on the X chromosome, is not known to be involved in sex determination. In the Japanese frog Rana rugosa the AR is located on the sex chromosomes (X, Y, Z and W). Phylogenetic analysis shows that the AR on the X chromosome (X-AR) of the Korean R. rugosa is basal and segregates into two clusters: one containing W-AR of Japanese R. rugos...
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ژورنال
عنوان ژورنال: Reproduction Nutrition Development
سال: 2004
ISSN: 0926-5287,1297-9708
DOI: 10.1051/rnd:2004062