1 / 10

The Wonders of Reproduction: A Guide to Asexual and Sexual Methods

Explore the fascinating world of reproduction, from asexual methods like anemone splitting to sexual processes like coral reef spawning. Learn about gametes, external fertilization, and internal fertilization in various species. Discover how different animals care for their offspring and ensure survival.

trey
Download Presentation

The Wonders of Reproduction: A Guide to Asexual and Sexual Methods

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. 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/

More Related