BIOL108 Lecture Notes - Lecture 18: Gametophyte, Zygosity, Fucus

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Trevor Pasanen

Document Summary

Finish sexual life cycles alternation of generations, diplontic life cycles, and the. Begin topic 6: plant diversity, evolution and life cycles. Alternation of generations in the brown algae laminaria sp. superfroup: chromalveolata. Multicellular haploid change and a multicellular diploid change. Whether the spores become female or male, is depended on genetics and/or. 1) zygote gets support but no nutrition from female gametophyte at the fertilization. 2) at the first step of meiosis the diploid sporophyte produces monomorphic haploid. 3) small haploid gametophytes produce male and female gametes. Gametes are oogamous (oogamy) few large nonmotile eggs, and many small motile sperm. oogamy has evolved independently in several protists. environmental conditions (plasticity). stage. spores. Isomorphic alternation of generations in the green algae ulva sp. (chlorophyta) A few protists and all animals follow this life cycle. Most of the cycle is a diploid. The zygote: divides mitotically to multicellular diploid embryo. Recap: in all animals and a few protists.