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- W2092020257 abstract "The somatic hybrid between Petunia parodii (2n = 14) and P. parviflora (2n = 18) is an aneuploid with 31 chromosomes. The missing chromosome was a product of interchange between a large, satellited P. parodii chromosome and a medium sized chromosome from P. parviflora. Chromosome pairing at meiosis in hybrid pollen mother cells is almost exclusively between strictly homologous chromosomes, i.e. the hybrid behaves as an allotetraploid. The mean bivalent chiasma frequency in the hybrid is achieved in an unusual way, by increase in the bivalent chiasma frequency of P. parodii chromosomes relative to that in the parent pollen mother cells, and decrease in the bivalent chiasma frequency of P. parviflora chromosomes relative to that in the parent. The distribution of chiasmata in the hybrid also differs from that in the parent. In the P. parodii chromosomes there is a very pronounced increase in the frequency of interstitial chiasmata. In respect of both chiasma frequency and distribution the results show that the P. parodii and P. parviflora chromosomes respond differently to control exercised by the hybrid genotype, in other words control is chromosome-specific." @default.
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- W2092020257 date "1985-08-01" @default.
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- W2092020257 title "The chromosome cytology of a somatic hybrid petunia" @default.
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- W2092020257 doi "https://doi.org/10.1038/hdy.1985.71" @default.
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