chapter49%20-%20remaining%20lecture%20slides%20on%20reproduction%20_1_

Chapter49%20-%20remaining%20lecture%20slides%20on%20reproduction%20_1_

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Reproduction Chapter 49
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Asexual Reproduction Type Benefit Fragmentation Parthenogenesis Budding Single parent: offspring exactly the same as the parent Advantages: energy efficient, most successful in a stable environment, don’t have to search for a mate, genetic stability
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Sexual Reproduction Fusion of gametes produces offspring: Egg large, non-motile; sperm small, flagellate Benefits: genetic assortment and variety adaptive in unstable, changing environment strong survivors selects against; removes harmful mutations Sperm and eggs released into water Internal copulation; terrestrials, sharks, mammals
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Hermaphroditism Single individual produces both eggs and sperm: tapeworm, earthworm, tunicates typically two individuals of the same species come together and swop each other’s sperm Self-fertilization prevented due to incompatibility (exc. comb jellies)
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Mammalian Reproduction Other mammals have estrous cycles: Sexually receptive only during estrus phase (pheromones) Uterus reabsorbs thickened endometrium if no conception Number of estruses depend on animal and species Humans have one menstrual cycle each month through their reproductive lives
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Male Reproductive System (Fig 49-3) Inguinal canal
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Seminiferous Tubules (Fig 49-4)
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Sperm Structure (Fig 49-6)
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Spermatogenesis occurs in Seminiferous Tubules iceteazegeg.wordpress. com/. ../spermatogenesi s/
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Semen Production Accessory Gland Secretions and importance Seminal vesicles Prostate Gland Bulbourethral glands Sperm move from seminiferous tubules to epididymis for maturation and storage Sperm then mix with secretions of accessory glands as pass through conducting tubes (forming semen):
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Chapter49%20-%20remaining%20lecture%20slides%20on%20reproduction%20_1_

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