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  in the chromosomal sex determination system, the chance for the occurrence of such sex-biased families would be very low, because the ratio of male and female would tend to bounce back close to 11 in the next generation. These breeding data also indicate that zebrafish sex determination is unlikely to be based primarily on sex chromosomes. Finding clues to the riddle of sex determination in zebrafish. Author information (1)centre for cellular and molecular biology, council of scientific and industrial research, uppal road, hyderabad 500007, india. How sex is determined has been one of the most intriguing puzzles in biology since antiquity. Sex determination in zebrafish is also partially influenced by environmental factors such as hypoxia, temperature, food availability, and population density (lawrence et al.). Snp-based linkage map for zebrafish reveals sex determination loci. Tong s, hsu h, chung b (2010) zebrafish monose x population reveals female.   zebrafish ( danio rerio ) lacks müllerian ducts and the amh receptor gene amhr2 but, curiously, retains amh. To discover the roles of amh in the absence of müllerian ducts and the ancestral receptor gene, we made amh null alleles in zebrafish. Results showed that normal amh prevents female-biased sex ratios. Sex determination of zebrafish photography by courtney serra and natalie kullberg how to identify sex in zebrafish identifying males identifying females the typical body shape of a male zebrafish is very slender compared to that of the female. Zebrafish (danio rerio) is a popular model organism, but the genetic basis of zebrafish sex determination, gonad development, and reproductive tract development are not fully understood, and understanding this basis could inform about the evolutionary conservation of these genes and the use of zebrafish to investigate and treat reproductive diseases.   how sex is determined has been one of the most intriguing puzzles in biology since antiquity. Although a fundamental process in most metazoans, there seems to be myriad of ways in which sex can be determined from genetic to environmental sex determination. This variation is limited mainly to upstream triggers with the core of sex determination pathway being conserved. Even though people have been using zebrafish as a sort of really hardcore model system since the 1980s, no one has figured out how sex is really determined in zebrafish. In mammals, the wnt gene family member 4 (wnt4) is required for female development. Although many features of zebrafish gonad development are similar to those in humans, zebrafish sex determination is more labile furthermore, genetic tools are available in zebrafish to dissect the mechanisms of sex determination, which should identify new genes and new gene functions relevant for human reproductive health.

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