Which of the following characteristics does the life cycle of the alga Ulva share with the life cycle of seed plants?
a. male and female gametes that look the same
b. male and female gametes produced by mitosis
c. sporophytes and gametophytes that look the same
d. diploid spores
e. fertilization in the open water
B; Both have a complete alternation of generations, in which gametophytes produce gametes by mitosis. The male and female gametes look the same in Ulva, but not in flowering plants, which have eggs and sperm (choice a). The Ulva has gametophyte and sporophyte plants that look the same, but in flowering plants they are very different. In Ulva, fertilization takes place in water; in plants it takes place inside the flower (choice e). Spores are haploid in all groups (choice d).
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