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Sci 9 Lesson 3 April 4 -  Introduction to Meiosis and Reproductive Systems

Sci 9 Lesson 3 April 4 - Introduction to Meiosis and Reproductive Systems






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    Sci 9 Lesson 3 April 4 -  Introduction to Meiosis and Reproductive Systems Sci 9 Lesson 3 April 4 - Introduction to Meiosis and Reproductive Systems Presentation Transcript

    • Ch. 6.1 Introduction to Meiosis and Reproductive Systems Chapter 6 pp. 188-190
      • Tell me what you already know about about the birds and the bees…
      • Sexual reproduction?
      • Eggs? Sperm?
      • The human reproductive systems?
      • Meiosis?
      • Chapter 5 Review
      • Asexual Reproduction
      • Only 1 parent is required
      • Offspring are genetically identical to the parent (clones)
      • Examples: binary fission, budding, etc.
      • Sexual Reproduction
      • 2 parents are required
      • Offspring are genetically different from each other, from either parent, and from any other member of their species
      • Genetic diversity:
      • Variation, or inherited genetic differences in a species
      • Sexual reproduction randomly sorts , or shuffles, DNA
        •  leads to genetic diversity
      • The combination of genes that an organism receives from its parents may allow it to better cope with changes in the environment
      •  Genetic diversity gives some organisms a survival advantage over others
      • Q: How is genetic information passed along from parent to offspring?
      • A: In the chromosomes the offspring inherits from its parents.
      • Diploid number: two sets of chromosomes (2n)
      • Example: Diploid number in a human cell
      • (2 x 23 chromosomes) = 46 chromosomes
      • 2n
      • Haploid number:
      • each set of inherited chromosomes; half the diploid number (n)
      • Example: Humans
      1 set of chromosomes from female parent = 23 (n) 1 set of chromosomes from male parent = 23 (n) 23 23 Sperm Egg
      • Gametes: specialized cells necessary for reproduction; produced by meiosis
      • male gametes = sperm cells
      • female gametes = egg cells
      • Fertilization:
      • the process where an egg cell is
      • penetrated by a sperm cell and
      • the haploid genetic information
      • of both male and female gametes
      • combines
      • Zygote:
      • the new diploid cell formed by the process of fertilization ; receives half its chromosomes from its female parent and half its chromosomes from its male parent
      • Embryo: the stage of a multicellular organism that develops from a zygote
      1 set of chromosomes from female parent = 23 (n) 1 set of chromosomes from male parent = 23 (n) 2 sets of chromosomes, 1 from each parent = 46 (2n)
    • p. 190
    • Male and Female Reproductive Systems
      • Gametes are produced in gonads (testes or ovaries)
      • Male Reproductive System
      • Male Reproductive System
      • Testes: two glands located in the scrotum; produce sperm (spermatozoa) and testosterone (male hormone)
      • Scrotum: sac holding both testes
      • Epididymis: location of sperm maturation
      • Vas deferens: stores and transports sperm
      • Seminal vesicles and prostate gland: secrete fluid which mix with sperm to form semen
      • Male Reproductive System
      • Cowper’s Glands: secrete alkaline (basic) fluid into semen to help neutralize the acidity of the urethra
      • Urethra: a dual purpose tube that both semen and urine pass through to leave the body
      • Penis: the organ of transfer of sperm to female
      • Female Reproductive System
      • Female Reproductive System
      • Ovaries: produce eggs (ova) and secrete estrogen and progesterone
      • Oviducts (aka Fallopian Tubes): tubes which transport eggs to the uterus
      • Uterus: location of fetus development during pregnancy
      • Endometrium: lining of the uterus; site of implantation and development of the fertilized egg
      • Cervix: neck or opening from the uterus to the vagina
      • Female Reproductive System
      • Vagina: birth canal and receptacle for penis during sexual intercourse
      • Urethra: opening to the bladder
      • Clitoris: a small, pea-shaped bump at the front of the labia that contains erectile tissue (counterpart to male penis.)
      • Vulva: term which describes the external female sex organs
      • Labia: folds of tissues which cover the vaginal opening
      • Interesting Facts
      • Eggs are formed inside the ovaries before birth (about 400,000 ); only about 400 will ever be released from the ovaries during ovulation
      • A healthy man can produce between 10 million to 50 million sperm per day !
      • The average swimming speed of a sperm is 8 inches per hour
      • Sperm can only survive inside a woman for 2 to 7 days
    • Homework for next class:
      • Complete the Introduction to Meiosis and Reproductive Systems worksheet
      • Study for your Genetics and Reproductive Systems quiz
    • Works Cited
      • http://thumbsterz.com/?p=534
      • http://www.astraware.com/bzzz/
      • http://www.lin-wood.org/161010115135732327/blank/browse.asp?A=383&BMDRN=2000&BCOB=0&C=56312
      • http://blog.dialaphone.co.uk/2009/09/16/text-a-question-10-sites-that-answer-questions-via-text/
      • http://hubpages.com/hub/Is-Sex-Necessary-for-Reproduction
      • http://missevanson.blogspot.com/
      • http://thunder.biosci.umbc.edu/classes/biol414/spring2007/index.php?title=Genetic_variation&redirect=no
      • http://baisically.blogspot.com/
      • http://www.shropshireivf.nhs.uk/about-fertility/reproductive-system.asp
      • http://topnews.net.nz/content/22039-sperm-dash-lead-new-male-contraception
      • http://theano5.blogspot.com/