Table 2.
Frequency of chromosomal anomalies and polymorphic variations
| Type of variation | Chromosome with variation | Number of cases (n=1276) | Frequency of variation group (%) | |
|---|---|---|---|---|
| Variation in “q” arm (qh+) | 1qh+ | 7 | 0.54 | 0.69 |
| 9qh+ | 2 | 0.15 | ||
| Presence of long stalks (pstk+) on the short arm “p” of the acrocentric chromosome | 13pstk+ | 4 | 0.31 | 4.12 |
| 14pstk+ | 2 | 0.15 | ||
| 15pstk+ | 25 | 1.95 | ||
| 21pstk+ | 7 | 0.54 | ||
| 22pstk+ | 15 | 1.17 | ||
| Pericentric inversion of chromosome | inv(9)(p11q13) | 47 | 3.68 | 4.54 |
| inv(Y)(p11q11) | 11 | 0.86 | ||
| Robertsonian translocation | rob(13;14)(q10;q10) | 16 | 1.25 | 1.40 |
| rob(21;21)(q10;q10) | 1 | 0.07 | ||
| rob(22;22)(q10;q10) | 1 | 0.07 | ||