Summary
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1.
InTradescantia virginiana var.humilis the following observations were made on meiosis:
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(i)
arrest of terminalisation of chiasmata
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(ii)
pairing of unequal chromosomes
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(iii)
torsion of chromatids
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(iv)
morphological change in chromosome
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(v)
pairing of fragments, discussed in relation to the chiasma theory of metaphase pairing.
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2.
InRhoeo discolor pachytene, diplotene and diakinesis stages were observed. The metaphase end-to-end pairing of the chromosomes was observed to follow earlier side-by-side pairing of homologous ends.
The observations show that both species obey the general principles of meiosis as recently outlined by Darlington.
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This work was carried on while visiting the John Innes Horticultural Institution.
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Koller, P.C. Further studies inTradescantia virginiana var.humilis andRhoeo discolor . Journ. of Genetics 26, 81–96 (1932). https://doi.org/10.1007/BF02991445
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DOI: https://doi.org/10.1007/BF02991445