Biochemistry, Genetics and Molecular Biology
5 years ago

Clonal fish hybrids defy mutation accumulation, challenge necessity of sexual reproduction.

Authorea
No evidence for accumulation of deleterious mutations and fitness degradation in clonal fish hybrid: Abandoning sex without regrets
Jan Ko, Jan R slein, Jan Pa es, Jan Kotusz, Karel Halačka, J. O., Jakub Fedor k, Nataliia Iakovenko, Karel Janko

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Sexual reproduction is common in nature, but it's costly. Some theories suggest that asexual organisms can accumulate harmful mutations faster, leading to their decline. However, a study on fish hybrids found no evidence of this. Mutations did increase in the clones over time, but they didn't become more harmful or affect the fish's fitness. Even the oldest clone didn't show negative effects from mutation accumulation. This suggests that factors other than mutations may explain why sexual reproduction is more advantageous in the short term.