Session 20 (Mammalian Fertilization and Early Development)

Session 20 (Mammalian Fertilization and Early Development)...

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Study Session 20 (Mammalian Fertilization and Early Development)
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MCB 181 Learning Goals for Study Session 20 (Mammalian Fertilization and Early Development) Be able to define terms such as gametogenesis and oogenesis and describe the distinguishing features of each process. Define polyspermy and briefly describe how it is prevented. Be able to define terms such as morula, blastocoel, blastula and blastomeres. Be able to describe the general changes that occur when a blastula is transformed into an embryo with three tissue layers and body axes.
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Sexual Reproduction in Animals The three fundamental steps of sexual reproduction are: Gametogenesis (producing sex cells) Mating (getting sex cells together) Fertilization (fusion of sex cells) Gametogenesis and fertilization are fairly similar in different groups of animals. Mating behaviors, however, show incredible evolutionary diversity.
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Development starts with fertilization Fertilization results from the union of a sperm and egg to form a zygote. Sperm and egg are gametes (haploid, n) and are produced by gametogenesis , involving meiosis. Zygote is diploid (2n) and fertilization therefore restores a full complement of maternal and paternal genes.
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The gonads ( testes and ovaries ) are the sites of gametogenesis. The gametes are formed by germ cells (2n) which originate very early in the developing embryo. The germ cells proliferate by mitosis, producing the oogonia and spermatogonia . These multiply by mitosis, producing diploid (2n) primary oocytes and primary spermatocytes . Differentiation is key to the formation of gametocytes from
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Session 20 (Mammalian Fertilization and Early Development)...

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