Parthenogenesis growth development of embryo without fertilization by male
Population all female
http//www.nova.edu/ocean/ghri/bbc_virginshark.htm l Many insects lizards salamanders fish turkeys 5 Sexual Reproduction gametes from opposite sexes unite http//civilliberty.about.com/od/historyprofiles/s s/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 male female join together to ensure fertilization not essential to sexual reproduction
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
10 Internal fertilization external development
After fertilization larvae (embryo) are released development occurs outside female body
http//www.microscopy-uk.org.uk/mag/indexmag.html http//www.microscopy-uk.org.uk/mag/artjan99/barna c.html http//getfile.ucoz.com/load/9-1-0-578 11 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. asptxtDocument542 http//www.fws.gov/archiecarr/photos/index.html http//www.nps.gov/pais/naturescience/reptiles.htm 12 Various levels of parental care http//animals.nationalgeographic.com/animals/phot os/baby-animals/american-crocodile-baby_image.html http//www.flmnh.ufl.edu/cnhc/potm-mar99.html 13 Internal fertilization internal development of eggs followed by live birth http//earth-advocates.org/index.phpoptioncom_co ntenttaskblogcategoryid22Itemid46 http//www.pacfish.org/sharkcon/documents/gruber.h tml 14 Internal fertilization internal development of embryo to fetus live birth http//www.seahorse-australia.com.au/pages/seahr_b iology.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/march200 6/ 15 In most species it is the female who carries the developing fetus to birth http//humangenetics.suite101.com/article.cfm/thre e_parent_embryo_mtdna http//www.sciencedaily.com/releases/2008/04/08041 0184336.htm http//www.scienceclarified.com/El-Ex/Embryo-and-E mbryonic-Development.html 16 Hermaphrodites
Organisms that change sex in order to reproduce
http//www.dkimages.com/discover/Home/Animals/Inve rtebrates/Molluscs/Gastropods/Marine-Snails/Crepid ulidae/Atlantic-Slipper/Atlantic-Slipper-1.html Crepidula fornicata a snail http//www.opalesurfcasting.net/la_faune_aquatique /la_crepidule_-_crepidula_fornicata_article1202.ht mlvar_recherchebar
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