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Reproduction_43 - Reproduction Chapter 43 Reproduction •...

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Unformatted text preview: Reproduction Chapter 43 Reproduction • D= the creation of new individuals • Cell reproduction – mitosis • Organismal reproduction & inheritance – Asexual or sexual Types of Reproduction • Asexual – No exchange of genetic material – fission • bacteria • sea anemone – Fragmentation w regeneration • Sea star • mitosis Fission Fragmentation & Regeneration Parthenogenesis Asexual Reproduction • Benefits – Don’t need a mate – Simpler – Faster – Energetically less costly • Drawbacks – No genetic variation Sexual Reproduction • Exchange genetic material • 2+ individuals • Meiosis & gametes required • Most organisms • Complex strategies Sexual Reproduction • Benefits – Genetic variation • Drawbacks – need a mate – More complex – slower – Energetically costly – Risk of disease/ predation hermaphrodite • 1 individual contains both male and female reproductive parts Sexual reproduction terminology • gonads • gametogenesis • Gametes – Ovum – sperm • copulation • Insemination • fertilization • zygote Gametes fertilization • External – Limited to water • Internal – In or near female reproductive parts – Typically requires copulatory organ External Fertilization Internal fertilization • Delivery of sperm In or near female reproductive parts • requires copulatory organ • Terms • Insemination • Fertilization Human reproduction Reproduction System • Reproductive organs • Reproductive tract • Accessory glands & organs Reproductive Organs • Gonads • Function – Produce sex cells- Gametes – Produce hormones Male Gonads Female Gonads Gamete Production • Male – Testes • Spermatozoa (sperm) – ~100-300 million/ day – Ave 1000 per second • Production begins at puberty • Female – Ovaries • Oocyte (egg) – 1/ month • Production begins in embryo – Cell division arrested in meiosis – Division resumes at puberty Spermatozoa Oocyte...
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This note was uploaded on 12/12/2011 for the course BIO 10 taught by Professor Staff during the Fall '11 term at Mesa CC.

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Reproduction_43 - Reproduction Chapter 43 Reproduction •...

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