BIOA02H3 Lecture Notes - Lecture 8: Plant Reproductive Morphology, Dioecy, Ovule

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

Document Summary

Lecture 8 (left is male organ, right is female) By knocking out gene for flowers, see that the gene for petals and sepals are just leaves (arodopsis) Flowers have 4 whorls: sepals, petals, stamens, and carpals. Sepals: protect inner flower organs before bud opens, are frequently green, and can form tubes main role is to provide defense to inner organs. Petals: typically colourful to attract pollinators can be fused to form a tube (either have individual leaves or can be fused to form corolla"s/tubes) Stamen: filaments + anthers anthers have 4 pollen sacs. > originally the anthers pollen sacs are separate (immature), then both fuse and open at the same spot (mature) > stigma: sticky landing platform on the top. > style: style is very long produces mucilage for nourishment. >> pollen grains latch onto the stigma and begin to germinate through the style in a race to fertilize the egg first correlation between fastest germinator and most fit plant.