Genes controlling chiasma frequency in Hordeum

Meiotic Behaviour and Nuclear DNA Variation in Some Species of Mammillaria (Cactaceae).

“…Significantly, M bocasana and M. boolii with univalents or spindle disturbance during cell division recorded moderate percentage of pollen sterility. All these facts suggest the genetic control of chiasma frequency (Gale andRess 1970, Ress andDale 1974). However, the formation of chiasma is controlled polygenetically by major genes which operate on a hierarchial system (Parker 1975).…”

Nuclear DNA content and chiasma behaviour in six species of Gymnocalycium Pfeiff. of the family Cactaceae

“…The species of five to eight microspores during microsporogenesis in telophase II, evidently, showed high percentage of sterility. All these facts suggest the genetic control of chiasma frequency (GALE and 1970;RESS and DALE 1974). However, the formation of chiasma is controlled polygenetically by major genes which operate on a hierarchial system (PARKAR 1975).…”

The effects of major genes on quantitatively varying characters in barley.: III. The two row/six row locus (V–v)

“…Localisation of chiasma formation would result in recombinationally inert regions and it is possible that changes in the positions of crossovers may allow the association between V-v, TOW and GN to be disrupted and recombinant genotypes to be produced. It is of relevance to note that Gale and Rees (1970) identified a gene or cluster of genes on chromosome 21 of barley that significantly affected chiasma frequency and 2r segregants from a 2r by 6r cross were shown to have a significantly lower mean chiasma frequency.…”