Abstract
The chromosomes in the cells of 1–2‐day‐old cod embryos were studied using light microscopic techniques. The observations revealed slightly non‐synchronous cell divisions, with at least three different mitotic phases present in a 1‐day‐old embryo. Surprisingly high percentages of abnormal metaphases and anaphases were found in normal‐looking embryos. In the 2‐day‐old embryos, free‐lying nuclei were observed in the periblast zone. Chromosome studies of these nuclei revealed a cleavage pattern of the chromosomes which differed from that of the other cells.
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