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A Possible Effect of Heterochromatin on Chromosome Pairing

J. B. Thomas and P. J. Kaltsikes
Proceedings of the National Academy of Sciences of the United States of America
Vol. 71, No. 7 (Jul., 1974), pp. 2787-2790
Stable URL: http://www.jstor.org/stable/63652
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Possible Effect of Heterochromatin on Chromosome Pairing
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Abstract

Rye chromosomes were selectively stained in the meiosis of triticale by means of heterochromatin banding techniques. Compared to wheat chromosomes, rye chromosomes showed reduced pairing at first meiotic metaphase. Within the rye genome this pairing failure was associated with the presence of large, terminal heterochromatic bands. Since these terminal bands of rye chromosomes are late replicating, the effect of heterochromatin could arise from an overlap between the processes of chromosome replication and chromosome pairing.

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