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Unformatted text preview: A can always be identified from its leaves. Reproduction in Ginkgo is a dioecious tree. Both male and female "strobili" are reduced in number of and size of sporangia produced. The male "strobili" are formed from short pendant microsporophylls, each of which has microsporangia. The haploid microspores are retained within the sporangia and the male gametophyte consists of a pollen grain containing multiflagellated sperm. Mature pollen is ultimately released from the diploid sporangia. The female reproductive structure consists of 2 ovules (which is what the megasporangia are typically called in the seed plants) each of which contain archegonia. Pollen delivers the sperm to the female ovules, but sperm, once released from the pollen grain (the male or microgametophyte) must swim to the egg contained within the archegonium of the ovule....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.
- Fall '09