Spermatocyte Division in Tuplidae. II. Rearrangement of Chromosomes in Translocated Heterozygotes of Tipula Oleracea (in German)
Mature sperms were irradiated with 60-kv x rays at a dose of 3500 r. The resulting chromosomal rearrangements were studied in F2 males obtained by mating F1 sons of irradiated fathers with normal females. By this method, rearrangements including the X chromosome were not obtainable. More than half of the F2 families contained rearrangements. Predominant among them were reciprocal translocations between 2 of the 3 autosomes, followed in frequency by transiocations between all 3 autosomes. Reciprocal translocations between an autosome and the small Y chromosome were present in about 5% of F2. During the first maturation division the kinetochores of the 2 chromatids of each chromosome (whether univalent or member of a bivalent or trivalent) can be oriented in 1 of 2 ways: they may be directed to the same pole (syntelic), or they may be oriented to different poles (amphitelic). When kinetochores are syntelic a chromosome lies with its axis parallel to that of the spindle and the data suggest that from early prometaphase until late anaphase it is subjected to forces which act in the direction of that pole towards which the kinetochores are oriented. Nearly all of the possible patterns of orientation of bivalents and multivalents were found, but the frequencies with which specific patterns occurred were not those predicted on the basis of chance alone.
- Research Organization:
- Max-Planck-Institut fur Meeresbiologie, Wilhelmshaven, Ger.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-010402
- OSTI ID:
- 4737207
- Journal Information:
- Chromosoma, Vol. 12, Issue 1; Other Information: Orig. Receipt Date: 31-DEC-63; ISSN 0009-5915
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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