BIO104-ReproductiveSystem-LecOutline.docx - REPRODUCTIVE...

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REPRODUCTIVE SYSTEM I. Review Recall MEIOSIS , oogenesis , spermatogenesis from BIO 103 Meiosis gamete producing nuclear division results in haploid gametes combining gametes during fertilization restores diploid # ZYGOTE (new cell) then divides by mitosis unique individual develops Reproduction Reproduction = replication 2 forms: 1. asexual reproduction 2. sexual reproduction Basic Pattern 1. conversion of raw materials from the environment into the offspring or sev cells that develop into offspring 2. transmission of hereditary material (DNA) from parents to offspring II. Asexual Reproduction
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Only one parent No special reproductive organs or cells Produce genetically identical copies CLONES Mutations expressed immediately Can have MORE offspring in a given time o Promotes rapid population growth Most successful colonizing new environments Much less genetic diversity less phenotypic diversity III. Asexual Reproduction – WHO? Usually simpler organisms o Bacteria, protozoa, cnidarians, bryozoans, crustaceans Rare among more complex invertebrates & vertebrates Always PARTHENOGENESIS in vertebrates
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