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Development - Animal Reproduction and Development...

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Animal Reproduction and Development
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Reproductive Modes A) Asexual Reproduction Examples: Binary Fission, Budding, Mitosis single parent organism produces genetically identical offspring without gametes B) Sexual Reproduction parents produce gametes, which fuse to produce variable offspring But, Sexual reproduction is more “costly” 1. Specialized structures for gametes 2. Behavioral challenges (courtship) 3. Investment in offspring (nourishment)
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Stages of Reproduction/ Development 1) Gamete Formation MEIOSIS Egg (n) Sperm (n) Males produce 4 sperm per germ cell 2n n n n n 4 sperm cells Gametes start out as (diploid) germ cells 2n n n n n 3 polar bodies ovum Females produce 1 egg per germ cell
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b) Internally land-dwellers specialized structures for housing gametes embryo more protected during development Fertilization may occur… a) Externally aquatic habitats gametes released into the environment large numbers of gametes produced 2) Fertilization Zygote (2n)
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3)
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