BIOA02H3 Lecture Notes - Lecture 2: Gametophyte, Sporophyte, Spermatozoon

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Ivana Stehlik

Document Summary

True ferns: today 75% of fern species are found in tropics, tiny aquatic fern (azolla) to 25m tall tree ferns. Interpretation of life cycle (ferns and lycophytes): the two generations are independent , male gamete (spermatozoid) self-propelled over short distances, spores wind dispersed over potentially long distances. Still strong water dependence: prothallium/spermatozoids: bottleneck, even though sporophyte has cuticle and vascular system. Feeding dependence of life cycle phases: gametophyte feeds sporophyte, both generations are photosynthetic, sporophyte feeds gametophyte. Mobility of life cycle phases: spermatozoids: self-propelled, short distance, spores: wind dispersed, pot.