Describe the life cycle of the giant kelp (Macrocystis), including both the gametophyte and sporophyte stages
What will be an ideal response?
There are two stages in the giant kelp life cycle. The gametophyte, which is greatly reduced in size (microscopic) and the large sporophyte. Here the dominant sporophyte produces spores by meiosis (in the special blades near the base of the thallus called sporophylls), which settle to the bottom to produce a microscopic gametophyte. The gametophyte produces gametes (sperm and eggs). These unite to produce the zygote that matures into a large sporophyte. The spores are negatively phototactic, so they will settle "away" from the surface of the water onto rocks.
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