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HOW THEY DO IT!

HOW THEY DO IT!. http://sofia.usgs.gov/projects/wadingbird_wcas/. Purpose of reproduction Replace the parents with 2 or more of the species # of babies depends on the ability of the species to make it to sexual maturity . http://www.dartmouth.edu/~burkle/Laura%20Burkle%20-%20Research.html.

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HOW THEY DO IT!

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  1. HOW THEY DO IT! http://sofia.usgs.gov/projects/wadingbird_wcas/ • Purpose of reproduction • Replace the parents with 2 or more of the species • # of babies depends on the ability of the species to make it to sexual maturity http://www.dartmouth.edu/~burkle/Laura%20Burkle%20-%20Research.html http://www.jburroughs.org/science/resources/flower/flowertitle.html www.wetwebmedia.com/snailidfaq3.htm www.saburchill.com/chapters/chap0037.html

  2. Types of Reproduction • Asexual • Does not mix up the genes • Offspring are identical to the parent • Susceptible to being “wiped out” anemone splitting (1:38) budding (2:47) www.geol.umd.edu/.../eltsite/lectures/sex.html http://www.unitedstreaming.com

  3. Sexual • Provides for genetic variation • Involves ½ the genes from 1 parent & ½ the genes from the other • Differences in nature • Some fish change sexes • Some creatures are hermaphrodites (have both sex organs) sea slug reproduction (1:49) • Sometimes the gender of the offspring is determined by the environment crocodile eggs <70° male >70°  female www.csulb.edu/depts/endo/ http://www.sardi.sa.gov.au/pages/ento/pasture_crop_pests/broad_snail.htm:sectID=214&tempID=1

  4. Gametes  sex cells egg (ovum) sperm Each of these has ½ of the genetic material • 2 ways to have sexual reproduction • external fertilization • needs water! http://www.morning-earth.org/Graphic-E/Cycle-index.html research.unc.edu/endeavors/spr2005/sperm.php http://www.bookrags.com/Ovum

  5. Clams, urchins, abalone – millions of eggs & sperm are released • No parental care (p.c.) • Slim chances of survival Coral Reef Spawning 2:33 courses.uvi.edu/BIO/141/Urchin.htm

  6. Fish (generalizations – there are exceptions!) • Millions of sperm are deposited near hundreds of eggs • No p.c. • Better chances of survival Link to stickleback mating http://www.sf.adfg.state.ak.us/region1/salmon/chilkat.cfm

  7. Frogs (generalizations – there are exceptions!) • Male mounts the females and releases sperm as the eggs are released. • No or very little p.c. • Better chances of survival Link to video www.dailycal.org/article.php?id=16489

  8. Internal fertilization – on land • No water – need a penis • Egg is fertilized in the female • Increased chance of survival • Parent selection • Reptiles (generalizations – there are exceptions!) • Lay eggs – can go anywhere  water is in the eggs • Little p.c. • Great chances of survival http://www.worldbook.com/wb/Students?content_spotlight/reptiles/live_reproduction

  9. Birds (generalizations – there are exceptions!) • Lay eggs  female sits with eggs • Shell around the water bag • Food (yolk) allows for longer development • High p.c. • Really great survival depts.washington.edu/ubna/recreation.htm www.speysideorganics.com/OrganicFarming.htm

  10. Mammals (generalizations – there are exceptions!) • Water bag inside mother • Better protection • Baby is with female @ all times • Temp. regulation • Better feeding • Long p.c. • Fewer offspring to provide for • really great survival! www.innovations-report.com/.../report-32662.html http://www.britannica.com/ebc/art/print?id=57413&articleTypeId=0 www.dhss.mo.gov/Nutrition_Pregnancy/

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