B Chromosomes and Female Sex Determination in Cichlid Fishes
Author Information
Author(s): Yoshida Kohta, Terai Yohey, Mizoiri Shinji, Aibara Mitsuto, Nishihara Hidenori, Watanabe Masakatsu, Kuroiwa Asato, Hirai Hirohisa, Hirai Yuriko, Matsuda Yoichi, Okada Norihiro
Primary Institution: Tokyo Institute of Technology
Hypothesis
Do B chromosomes have a functional effect on sex determination in Lake Victoria cichlid fishes?
Conclusion
B chromosomes in Lake Victoria cichlids have a functional effect on female sex determination, leading to a female-biased sex ratio.
Supporting Evidence
- B chromosomes were found at a high prevalence rate (85%) in the studied cichlid species.
- Cross-breeding experiments showed that females with B chromosomes produced a higher proportion of female offspring.
- FISH analysis indicated that B chromosomes are derived from sex chromosomes.
Takeaway
Some fish have extra chromosomes called B chromosomes that can help determine if they are male or female. In one type of fish, having these extra chromosomes means more females are born.
Methodology
Cytogenetic analysis and cross-breeding experiments were performed on 11 cichlid species from Lake Victoria.
Potential Biases
Potential bias in sample selection from commercial sources.
Limitations
The study focused on a specific population and may not represent all cichlid species.
Participant Demographics
Wild populations of 11 cichlid species from Lake Victoria.
Statistical Information
P-Value
p<0.01
Statistical Significance
p<0.01
Digital Object Identifier (DOI)
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