The influence of B-chromosomes on chiasma frequencies in Black Mexican Sweet Corn
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The mean chiasma frequency at first metaphase of meiosis in pollen mother cells of a maize variety, Black Mexican Sweet Corn, increases with increasing number ofB-chromosomes. The increased chiasma frequency is also reflected by a decrease in the number of rod bivalents at first metaphase.
There is some indication that theB-chromosomes also influence the distribution of chiasmata between pollen mother cells.
The increase in chiasma frequency due toBs is closely analogous to the increase in crossing-over carlier attributed toBs between marker genes located on chromosome III. Together the evidence confirm the role ofBs in controlling genetic recombination at meiosis.
KeywordsMarker Gene Mother Cell Pollen Mother Cell Genetic Recombination Maize Variety
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