Summary
There is wide variation in chromosome size and nuclear DNA amount between the 22 species studied within the genus Crepis. The changes in DNA amount involve all, or most of, the chromosomes within species complements, but structural rearrangements due to inversions and interchanges have made the distribution of changes somewhat unequal. There is an evolutionary reduction in the amount of DNA with the most primitive perennial species having higher DNA values than the more advanced annual species. The advanced species have more chromosomes with median centromeres than the primitive species and show increased symmetry. Nuclear DNA amount is positively correlated with both seed size and pollen grain size.
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Jones, R., Brown, L. Chromosome evolution and DNA variation in Crepis. Heredity 36, 91–104 (1976). https://doi.org/10.1038/hdy.1976.10
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DOI: https://doi.org/10.1038/hdy.1976.10
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