CYTOGENETIC BEHAVIOR OF SPORE KILLER GENES IN NEUROSPORA

• DOI: 10.1093/genetics/93.3.607
• Publication Date: 2021-04-22T13:33:43Z
• Authors: Namboori B Raju
• Keywords: Ascus (bryozoa); Multinucleate; Neurospora

ABSTRACT Crosses heterozygous and homozygous for Sk–1, Sk–2 Sk–3 were examined by light microscopy. All three Spore killers behave similarly. In heterozygoua killer x sensitive crosses, meiosis ascospore development are normal until after the second postmeiotic mitosis when four of eight ascospores in each ascus stop developing degenerate. The surviving carry killer. Death sensitives thus occurs only alleles, SkK SkS, have segregated into separate ascospores. Homozygous crosses do not show such a pattern degeneration. Either all or, if some fail to mature, they resemble degenerating asci.——With Sk–2, it was shown that SkS nuclei abort both present same ascospore. Mutants affecting used obtain large enclosing meiotic products common cytoplasm. then undergo degeneration would be seen werc sequestered ascospores, viable progeny recovered undiminished numbers mixed multinucleate germinated. four-spored mutant, where encloses single nucleus following meiosis, nevertheless occurs, even though third nuclear division is omitted. Cycloheximide temperature treatments affect: expression SkK.