Animal reproduction
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Animal Reproduction. Sexual & Asexual. By Diana L. Duckworth Rustburg High School Campbell County. Asexual Reproduction. Budding – small part of parent’s body grows into new organism. http://www.microscope-microscope.org/gallery/Mark-Simmons/images/hydra2.jpg. Genetically identical

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Animal Reproduction

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Animal reproduction

Animal Reproduction

Sexual & Asexual

By

Diana L. Duckworth

Rustburg High School

Campbell County


Asexual reproduction

Asexual Reproduction

  • Budding – small part of parent’s body grows into new organism

http://www.microscope-microscope.org/gallery/Mark-Simmons/images/hydra2.jpg

Genetically

identical

clones

http://johnson.emcs.net/life/images/anemone.bmp


Asexual reproduction1

Asexual Reproduction

  • Regeneration – parent separates into two or more pieces & each piece forms new organism

    • In some instances just a new part grows

    • Sponges, sea stars, jellyfish, planaria

    • Also be clones

http://www.starfish.ch/reef/echinoderms.html


Asexual reproduction2

Asexual Reproduction

  • Parthenogenesis – growth & development of embryo without fertilization by male

  • Population all female

http://www.nova.edu/ocean/ghri/bbc_virginshark.html

Many insects; lizards, salamanders, fish, turkeys


Sexual reproduction gametes from opposite sexes unite

Sexual Reproduction – gametes from opposite sexes unite

http://civilliberty.about.com/od/historyprofiles/ss/news080406_2.htm

  • Species with sexual reproduction are said to be dioecous – separate sexes

  • Often exhibit distinct sexual dimorphism – males and females look different

  • Sperm (male gamete) formed by meiosis in testes

  • Eggs (female gamete) formed by meiosis in the ovary


Mating

Mating

  • Mating – male & female join together to ensure fertilization; not essential to sexual reproduction

http://www.snakesandfrogs.com/scra/lizards/greenanole.htm

http://www.torreypine.org/animals/reptiles.html

http://www.eeb.cornell.edu/agrawal/photos/milkweed%20fauna/pages/Tetraopes%20tetrophthalmus%20mating.html

http://www.hickerphoto.com/elephants-mating-205-pictures.htm


External fertilization

External Fertilization

  • Males & females release sperm & eggs into the environment – sperm & egg join outside the body

    • Males & females may come into close proximity

    • Eggs & larvae develop outside the body

    • Many gametes produced; many zygotes formed

    • Usually aquatic

http://www.biol.andrews.edu/everglades/organisms/Invertebrates/marine_inverts/Arthropoda/Atlantic%20Horseshoe%20Crab/atlantic_horsehoe_index.htm


External fertilization e g salmon

External Fertilization – e.g. Salmon

http://escoberphoto.com/travel/katmai.html

http://www.biology-blog.com/blogs/archives/Biology-blog/520525028-Feb-14-2008.html

http://www.mass.gov/dfwele/dfw/dfwstksl.htm


Internal fertilization

Internal fertilization

  • Joining of sperm & egg inside the body after mating

    • Ensures selection of mate (not random); promotes diversity

    • Parents protect and care for young

    • Does not require water; can occur on land

    • Less sex cells produced; increases probability of successful reproduction

    • Common in birds, reptiles & mammals


Internal fertilization external development

Internal fertilization; external development

  • After fertilization, larvae (embryo) are released & development occurs outside female body

  • Example: Barnacles

http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artjan99/barnac.html

http://getfile.ucoz.com/load/9-1-0-578


Internal fertilization development

Internal fertilization & development

  • Females put large amounts of energy into development of embryo – very few in litter or clutch – different schemes

  • Eggs in “shell” are laid and either abandoned or nurtured in nest

http://crd.dnr.state.ga.us/content/displaycontent.asp?txtDocument=542

http://www.fws.gov/archiecarr/photos/index.html

http://www.nps.gov/pais/naturescience/reptiles.htm


Various levels of parental care

Various levels of parental care

http://animals.nationalgeographic.com/animals/photos/baby-animals/american-crocodile-baby_image.html

http://www.flmnh.ufl.edu/cnhc/potm-mar99.html


Internal fertilization internal development of eggs followed by live birth

Internal fertilization & internal development of eggs; followed by live birth

http://earth-advocates.org/index.php?option=com_content&task=blogcategory&id=22&Itemid=46

http://www.pacfish.org/sharkcon/documents/gruber.html


Internal fertilization internal development of embryo to fetus live birth

Internal fertilization, internal development of embryo to fetus, live birth

http://www.seahorse-australia.com.au/pages/seahr_biology.html

In seahorses, eggs are deposited in the male

where they are fertilized and develop. Babies

born live.

http://www.abc.net.au/science/scribblygum/march2006/


In most species it is the female who carries the developing fetus to birth

In most species, it is the female who carries the developing fetus to birth…

http://humangenetics.suite101.com/article.cfm/three_parent_embryo_mtdna

http://www.sciencedaily.com/releases/2008/04/080410184336.htm

http://www.scienceclarified.com/El-Ex/Embryo-and-Embryonic-Development.html


Hermaphrodites

Hermaphrodites

  • Organisms that change sex in order to reproduce

http://www.dkimages.com/discover/Home/Animals/Invertebrates/Molluscs/Gastropods/Marine-Snails/Crepidulidae/Atlantic-Slipper/Atlantic-Slipper-1.html

Crepidula fornicata – a snail

http://www.opalesurfcasting.net/la_faune_aquatique/la_crepidule_-_crepidula_fornicata_article1202.html?var_recherche=+bar


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