Abstract
During the preparatory phase for synchronous meiotic zoosporogenesis in Ulva mutabilis Føyn, mutant Slender, measurements have been made of sporangial size and number, lipid-free weight, DNA, RNA, chlorophyll and protein. Both ordinary mitotic division and chlorophyll synthesis seem to be blocked during the preparation for meiosis. Other constituents increase 2–2.5 times in the 40 h preparatory period, and then stop as identifiable meiotic prophase stages occur. For DNA the data suggest that two successive rounds of replication take place between the last mitotic division and meiosis. After meiosis a third rapid replication of DNA takes place in the dark. Together the data indicate that each meiotic chromosome consists of at least 4 longitudinal strands.
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