Abstract
Genetic and environmental modifications of crossing-over frequency were studied in crosses segregating forts (linkage group V) andasco (group VI), both autonomous ascospore color markers.
The effect of temperature on crossing over was different not only for different chromosomes, but also for the same chromosome region in different crosses. The second-division segregation frequency ofts varies from 20 to 80% at 25°C in different crosses. No indication of a cytoplasmic effect on crossing over was obtained.
The second-division segregation frequency ofts usually increased in backcrosses. But occasionally significant decreases from preceding crosses were also observed in later backcross generations in spite of the fact that upward selection had been made.
The effect of temperature on the increase in crossing-over frequency was limited by genetic potential.
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Nakamura, K. Heterogeneity in crossing-over frequency inNeurospora . Genetica 37, 235–246 (1966). https://doi.org/10.1007/BF01547135
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DOI: https://doi.org/10.1007/BF01547135