1 / 29

Sexual Reproduction

Sexual Reproduction. Chapter 38. Asexual Exact copy Mitosis One parent Constant conditions. Sexual Genetic variety Meiosis = eggs & sperm Two parents Changing conditions. I1. Sexual/Asexual Reproduction. Budding of polyps. Asexual examples : Hydra. Regen-eration Of cut pieces.

micheal
Télécharger la présentation

Sexual Reproduction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sexual Reproduction Chapter 38

  2. Asexual Exact copy Mitosis One parent Constant conditions Sexual Genetic variety Meiosis = eggs & sperm Two parents Changing conditions I1.Sexual/Asexual Reproduction

  3. Budding of polyps Asexual examples: Hydra Regen-eration Of cut pieces

  4. Amoeba asexual division Nucleus 2nd amoeba

  5. Asexual Reproduction: Runners in strawberries Spores in Puffball Mushrooms

  6. Sexual Reproduction

  7. “Joey” develops in a Pouch

  8. Flowering Plants Sexual Reproduction Dry Pollen For sperm

  9. Ferns Sexual & Asexual Reproduction Sexual & Asexual

  10. Egg Round Floats Food reserves One Ovaries 1N haploid Sperm Oval Flagella No food reserves Many secrete enzyme to penetrate egg membrane Testicles 1N haploid Comparison of Egg & Sperm

  11. Sperm • 1/600th inch • Survives in Temperature of 93o – 97o • 3 Parts: • Head or Cap – holds Genetic Information of Father • Body – filled with mitochondria & supplies energy • Tail – flagellum to propel and move • 200 million sperm made every 24 hours • 750 feet of twisted tubules which contain specialized cells that each care for about 150 sperm • Testosterone & Estrogen made exactly balanced to develop specific sexual characteristics

  12. February 23, 2010 • Draw a sperm and label its parts • Review Vocab #2 • Notes 38.1 • Inside Story page 1033

  13. Meiosis in the Gonads Sperm Meiotic cell division Egg

  14. Gonads make gametes! Testes make sperm

  15. Male Reproduction • Scrotum – sac surrounding testes that maintain temperature – muscles contract/relax • Temperature must be 3o below body for sperm • Testes – produces sperm cells haploid (1n) produce 4 • Sperm – male gamete • Enzymes in cap or head allow sperm to penetrate egg • Nucleus contains genetic material • Mitochondria – lots for energy to move • Flagellum – for movement

  16. Epidiymis – stores sperm from testes until mature • Vas Deferens – duct that carries sperm to ejaculatory glands and urethra • Semen - fluid • Seminal Vesicles - at base of bladder that secretes mucous like fluid to increase fructose energy • Prostate glands – underneath bladder secretes alkaline fluid to help sperm survive & move • Bulburethral Glands – secrete clear sticky alkaline fluid protecting sperm by neutralizing acidic environment of vagina

  17. Uretha– tube running from the bladder that carries urine out through the penis. • Semen enters the urethra after a muscle closes it off from the bladder. • Semen is ejaculated through this tube that runs the length of the penis.

  18. Chromosomes Sex Chromosome Y determines a Male

  19. February 24, 2010 • List the hormones and their actions for the male and female reproductive system. • Trace the pathway of sperm from the testes • Notes cont….

  20. Reproduction Hormones - Puberty

  21. Gonads make gametes! Ovaries make eggs

  22. Female Reproductive System • Ovary – size of an almond, where eggs are produced approximately 400/life • Egg production is before birth, goes through meiosis – prophase 1 then rests till sexual maturity • Oviduct – tube that transports the egg to the uterus, fertilization occurs here • Ovulation – oocytes finish meiosis the egg ruptures the ovary & released into oviduct (1n) 1 egg, 3 polar bodies dissolve • Fertilized egg remains in oviduct for 7 days then divides and embeds in the lining of uterus–9 months

  23. Unfertilized - the egg and lining of the uterus will shed called the… • Phases of Menstrual Cycle: • 1. Flow Phase - Discard of egg & uterine lining – lasts approximately 5 days • 2. Follicular Phase – FSH increases & another follicle goes through meiosis II, lasts from day 6-14, LH released & Ovulation occurs around day 14 by rupturing ovary • 3. Luteal phase – 15-28 days the corpus luteum releases progesterone & some estrogen to increase blood supply (lipids) preparing for pregnancy by thickening the endometrium lining of the uterus

  24. February 25 • Draw the negative feedback cycle… Then describe it in words. • PS Lab 38.1 • Finish up Notes

  25. Negative Feedback Cycle

  26. Menstrual Cycle

  27. Tracking Hormone Levels Make a graph showing the changes in amounts of LH & FSH throughout the menstrual cycle. Use 2 different colors & label please. Make another graph showing the levels of estrogen and progesterone.

  28. Tracking Hormone Levels (cont) • Analysis: • 1. Describe the pattern of each hormone. • 2. Indicate with a dashed line how progesterone level would look if pregnancy occurred.

  29. Tubal ligation

More Related