Figure 2–84. Model for the origin of eukaryotic cells by symbiosis (After Margulis, 1983).
The decisive role in elucidating this problem belongs to the discovery
of genetic material (DNA) in some cellular organelles — chloroplasts (Ris,
Plaut, 1962; Chun et al., 1963; Sager, Ishida, 1963), mitochondria (Nass,
Nass, 1963 a, b; Luck, Reich, 1964; Schatz et al., 1964), etc. Mainly in