1 / 9

Internal vs External Fertilization & Development

Internal vs External Fertilization & Development. Fertilization. Fertilization is the union of egg and sperm Egg (n) + Sperm (n) = zygote 2n. External Fertilization. External fertilization occurs outside of female parent Fish Amphibians Aquatic vertebrates. External Fertilization.

lourdes
Download Presentation

Internal vs External Fertilization & Development

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. Internal vs External Fertilization & Development

  2. Fertilization • Fertilization is the union of egg and sperm • Egg (n) + Sperm (n) = zygote 2n

  3. External Fertilization • External fertilization occurs outside of female parent • Fish • Amphibians • Aquatic vertebrates

  4. External Fertilization • Produce many eggs in water because: • Eggs are laid in the water • There is no parental care • Fertilization & development occur outside the female body

  5. Internal Fertilization • Internal fertilization occurs inside the female parent • Reptiles (lay many eggs) • Birds (lay only a few eggs) • Mammals • development takes place inside the female body

  6. Internal Fertilization • Chance of survival is high • Zygote forms inside the female body.

  7. Development of the fertilized egg • External Development • Develops outside the parent • Aquatic development: develops in water. Egg get nutrition from yolk sac. • Terrestrial Development: land development

  8. Internal Development • Internal Development occurs in mammal inside female • Placental – mammals that possess an internal structure that forms joining of embryo and mother (mice, cats dogs, whale, human) • Allows for longer internal development • Exchange of O2, CO2 & nutrients between mother and embryo

  9. Non-placental Mammals • Non-placental – have external development • Marsupials & monotremes  egg laying mammals

More Related