Somatic crossing-over in Antirrhinum majus

@article{Harrison1977SomaticCI,
  title={Somatic crossing-over in Antirrhinum majus},
  author={Brian J. Harrison and Rosemary Carpenter},
  journal={Heredity},
  year={1977},
  volume={38},
  pages={169-189}
}
SummaryMany aberrant somatic sectors on the corollas of heterozygous Antirrhinum majus can be related to a number of genetic causes while twin-spots are attributed to somatic crossing-over, hitherto, considered a relatively rare occurrence in higher plants. The administration of caffeine increases the frequency of single aberrant sites and also of twin-spots. The inclusion of the unstable genes nivea-recurrens and pallida-recurrens has no effect on the frequency of twin-spots. Homozygosity… 
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TLDR
There has always been uncertainty as to whether genetic changes which are sufficiently frequent to give obvious somatic variegation can be regarded as in the same category as gene mutations happening at more ordinary frequencies, but recent developments tend to strengthen the belief that such differences do exist.
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TLDR
This report demonstrates induced premeiotic exchange of linked markers in an angiosperm, simulating crossing over, and indicates a different mechanism, possibly a translocation between homologous chromatids.
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TLDR
A new type of genetic instability in two Antirrhinum plants is investigated, associated with a special allele of Pal, an anthocyanin-producing gene, which is denoted as palrec-low to distinguish it from the hitherto characterised “standard” palrec, which has a much higher mutation frequency.
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TLDR
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TLDR
Observations indicate that it is not the mere inhibition of DNA synthesis, but some rather more specific event in DNA repair which is responsible for complementary exchanges in somatic crossing over.
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TLDR
Paired and unpaired spots of normal green and greenish yellow were observed on the two simple leaves and the first compound leaf of a heterozygous Y, , y I , light-green plant.
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SummaryImbibition of dihydroquercetin, dihydrokaempferol and naringenin by the flowers of certain genotypes of Antirrhinum majus enables rapid identification of hypostatic genes involved in pigment
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