Abstract:
:Gene segregation at six protein loci was analysed in progeny from tetraploid males and females obtained by suppression of first mitosis. The triploid full-sib families from five tetraploid males and the diploid gynogenetic lines from four tetraploid females were examined. The proportions of heterozygous gametes (0.83 on the average) were significantly higher than expected from tetrasomic inheritance (0.667) at all the loci studied. This was explained by preferential pairing of homologous chromosomes. The proportions of heterozygous gametes were significantly different between loci, but the variations were not correlated with the gene--centromere distances. Our results showed that, at least for one locus, the homozygous gametes mainly resulted from pairing of homologous chromosomes rather than from pairing of homologous chromosomes, quadrivalent formation, and chromatin exchanges between homologous chromosomes.
journal_name
Genomejournal_title
Genomeauthors
Diter A,Guyomard R,Chourrout Ddoi
10.1139/g88-092subject
Has Abstractpub_date
1988-08-01 00:00:00pages
547-53issue
4eissn
0831-2796issn
1480-3321journal_volume
30pub_type
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