Chromosome

Biology

Sex Chromosome Fight: How Competition Is Affected X vs Y Sperm Fitness

SLXL1/SLX/SLY1/SLY2 does not interact with other spindolins. Credit: Proceedings of the National Academy of Sciences (2025). doi:10.1073/pnas.2421446122 Evolutionarily, fitness is defined as the ability of an organism to survive and replicate that gene for the next generation. Genes affect fitness and sometimes compete with each other within organisms. This competition, or weapons competition, is usually difficult to observe when the…