Reproduction in animals

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Reproduction in animals

  1. 1. Reproduction in Animals • Important to the survival of a species • May increase genetic variation • Two Types of Reproduction: – Asexual – one parent, offspring are clones • Bacteria, plants, amoebas, and simple organisms – Sexual – joining of gametes (egg/sperm) increases variation • Some plants, many animals • Reproductive strategies changed as animals evolved from living in water to living on land
  2. 2. Reproduction and Development in Animals Fertilization Requirements Advantages Disadvantage Examples s External - Large # of Parents don’t Less chance Frogs, coral, - gametes join gametes need to be in sponges, outside of body - Water of fertilization the same most fish place - Specialized - chance of Internal fertilization Parents must Birds, reptiles, - gametes join organs (ie: be close mammals, penis) - Lower # of inside of body together some fish - Mating rituals gametes Development Requirements Advantages Disadvantage Examples sExternal Water or Shell No parental Frogs, many to prevent Low chance- growth of care needed fish, reptiles,offspring occurs drying out of survival birdsoutside of parents’bodyInternal Specialized chance of- Growth of offspring Pregnancy is Mammals, organs supportoffspring occurs survival demanding some sharks &inside of parent’s developing some snakesbody egg ( uterus, placenta)
  3. 3. Reproductive Adaptations in Animals Amplexus in Frogs Eggs prevent reptiles from drying out on land Specialized organs in damselflies

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