Summary
Chiasma variation has been studied in material from 9 different natural populations of Crepis capillaris. Significant differences in mean cell chiasma frequency were found between populations, between families within populations and also between plants within families. An analysis of chiasma distribution among 11 regions spread over the 3 chromosome pairs revealed an underlying tendency for chiasmata to occupy characteristic positions in bivalents. However, this is a quantitative rather than qualitative effect and marked variation in chiasma position distributions were evident at population, family and individual plant levels. The findings of this survey are discussed in relation to the significance and role of genetical recombination in natural populations.
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Whitehouse, C., Edgar, L., Jones, G. et al. The population cytogenetics of Crepis capillaris I. Chiasma variation. Heredity 47, 95–103 (1981). https://doi.org/10.1038/hdy.1981.62
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DOI: https://doi.org/10.1038/hdy.1981.62
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