LIFESCI 1 Lecture Notes - Lecture 17: Adaptive Radiation, Flowering Plant, Gametophyte
Document Summary
Flung away from the plant: how genetic material is dispersed away from the parent plant. Really large male cones that produce the pollen; the female reproductive part are on a separate plant (orange seeds with ovules) Instead of producing cones, the female produces fleshy ovule that becomes the seed. On the sporophyte the gametophyte grows on the sporophyte. Pollen grain makes contact with outside female cone. Female cone opens a bit and allows pollen to fertilize cone. Seeds dispersed (have projections that are carried by the wind) Dense populations of all the same species. Genetic diversity within the population even if they are all the same species. Offspring are not directly competing for resources with parent plant. Allows plants live in drier environment and to be spaced apart further. Moving genes further out of the population. Prevents inbreeding: rare allele that is deleterious. Angiosperms: seeds and gametes travel even further. Potential for pollen and seeds to travel much further.
