Robertsonian translocations (RT’s) are present in 0.1% of the general population and 1% of the infertile population. Two types of RT’s occur more frequently than all others, being 45,XX,rob(13;14)(q10;q10) and 45,XX,rob(14;21)(q10;q10) respectively. In the present report, an uncommon RT in a female with spontaneous repeated abortions is reported. Cytogenetic analysis of a couple with repeated a...

Cytogenetic analysis in 60 clinically suspected cases of Down syndrome and their parents was carried out using conventional Giemsa–trypsin-banding technique. Fifty-five individuals (91%) exhibited a free trisomy 21. Robertsonian translocations were seen in three cases and two cases exhibited a normal karyotype. A four-month-old child, the second-born of non-consanguineous parents, possessed an ...

Synaptonemal complex (SC) chains were revealed in semisterile intraspecific F1 hybrids of Ellobius tancrei Blasius, 1884 (2n = 49, NF=56 and 2n=50, NF=56), heterozygous for Robertsonian (Rb) translocations. Chains were formed by Rb submetacentrics with monobrachial homology. Chromosome synapsis in spermatocytes of these hybrids was disturbed, apparently because of the problematic release of the...

The karyotypes for a unique series of cloned untransformed and spontaneously and urethan-transformed mouse lung alveologenic carcinoma cell lines were compared by G-banding. All cell lines exhibited altered chromosome number accompanied by chromosomal aberrations. Both spontaneously and chemically transformed lines contained a higher proportion of cells carrying double minutes, short-arm chromo...