BISC 101 Chapter Notes - Chapter 40: Pollen Tube, Ovule, Fruit Anatomy
27 Oct 2017
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Quick efficient way reproduce large numbers of offspring. Megasporocytes = f // microspores = m. Undergo meiosis generate megaspores & microspores. Divide mitotically & give rise f/m gametophytes. Colourful in bee-pollinated species outcrossing: what are the advantages and disadvantages of self fertilization versus those of. Requires cross pollination that is successful whereas self pollination is almost alway. Ovary develops into pericarp of fruit after fertilization. Mature ovule contains both gametophyte & sporophyte tissue. Form zygote & endosperm: describe the formation of the male gametophyte. Microspores mitosis 2 cell m gametophyte + generative cell + tube cell + outer coat. = pollen grain: describe the formation of the female gametophyte. Megasporocyte meiosis 4 haploid megaspores (1 survives) Megaspore 3x mitosis f gametophyte or embryo sac + 8 haploid nuclei: describe the female gametophyte. Micropyle (little gate) access sperm nucleus: define pollination. 2 x synergids (guide pollen tube embryo sac) 2 x polar nuclei (= 1 cell) endosperm.
