Questions on Chapter 49

Questions on Chapter 49 - Reproduction Chapter 49 Most...

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Reproduction Chapter 49 Most animals reproduce sexually by fusion of sperm and egg, but some animals reproduce asexually and some can reproduce either way, depending on conditions Asexual Reproduction (Fig 49-1, Fig 49-2): single parent where genes of offspring are identical to parent’s (except for mutations). Identify four benefits of this form of reproduction Types of Asexual Reproduction: Describe the three forms of asexual reproduction: budding, fragmentation and pathenogenesis and provide an example of each Sexual Reproduction: fusion of two types of gametes (egg and sperm) produces offspring . Describe the benefits of sexual reproduction. Fertilization: Differentiate between external and internal fertilization; provide examples and representative animals that undergo each type. Hermaphroditism: Single individual produces both eggs and sperm e.g. tapeworm, earthworm, tunicates. Can these species self fertilize? Is this advantageous? How do these individuals prevent interspecies fertilization? The structure and function of each organ of the human male reproductive system: In vertebrates, gonads (testes or ovaries) produce gametes and reproductive hormones Male Reproductive System (Fig 49-3): Testes are contained in the scrotum as paired male gonads: Serves as a cooling unit – why ? Connected to pelvic cavity by inguinal canals: what is an indirect inguinal hernia? What is the role of the seminiferous tubules ? Describe spermatogenesis (Fig 49- 5) – where are the dedifferentiated spermatogonia held? Describe the structure of sperm (Fig 49-6): where are the mitochondria concentrated, why are they important to sperm motility? What type of microtubule formation characterizes the flagella of sperm? The acrosome has an important role in egg penetration – what is it? Conducting Ducts; sperm moves from seminiferous tubules to epididymis and vas deferens – what is the role of the epididymis and the vas deferens in the sperm’s life history? After movement to the epididymis, where do sperm go? How many sperm are there in a normal human ejaculate? What is semen? Three accessory glands provide secretions important to sperm viability and utility – name them and their secretions, and describe how each contributes to the viability of sperm, and aids in fertilization
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The Penis - Three columns of erectile tissue, 2 cavernous bodies and 1 spongy body (surrounds urethra) – what does erectile mean? Which neurons dilate the arteries on the penis? How does Viagra work?
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Questions on Chapter 49 - Reproduction Chapter 49 Most...

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