21
General Overview
+
6′
5′
4′
2′
2′
2
3′
1
+
+
+
+
ab
+
–
–
s.r
a.r.
+
3
R!
FIGURE 1.28 Life cycle of Chlamydomonas sp.: 1, mature cell; 2, cell-producing zoospores; 2′, cellproducing gametes (strain + and strain −); 3, zoospores; 3′, gametes; 4′, fertilization; 5′, zygote; 6′, release of
daughter cells. R!: meiosis; a.r.: asexual reproduction; s.r.: sexual reproduction.
FIGURE 1.29 Life cycle of a diatom: 1, vegetative cell; 2–3, vegetative cell division; 4, minimum cell size;
5, gametogenesis; 6–7, fertilization; 8, auxospores; 9, initial cells. R!: meiosis.