Reproduction in animals


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Easy slides to explain reproduction in animals to Secondary students.

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Reproduction in animals

  1. 1. Reproduction in animals Reproduction is the biological process by which new individual organisms are produced. Look at the diagram and try to match each photograph with the main types of reproduction. E.g. Ducks reproduce… asexually by gemmation / fragmentation sexually. They are unisexual / hermaphrodites. REPRODUCTION ASEXUAL SEXUAL GEMMATION FRAGMENTATION UNISEXUAL HERMAPHRODITES Duck Starfish Coral Snail
  2. 2. Asexual reproduction occurs in the most simple animals. There are two main types: Worm Starfish Starfish Starfish Fresh water hydra Asexual reproduction in animals Gemmation Small buds appear on the body of the progenitor or “parent” and develops into a new individual. Fragmentation A new organism grows from a fragment of the progenitor or parent. It is common in worms and starfish. Worm Starfish
  3. 3. Sexual reproduction in animals Sexual reproduction in animals requires two members of the opposite sex, a male and a female. Each one has different reproductive organs. These are called gonads. Depending on the types of gonads, animals can be: Hermaphrodites Hermaphrodites Each individual has one type of gonad: male or female. Hermaphrodites Unisexual deers ducks dogs Each individual has both male and female gonads. snail earthworm
  4. 4. Fertilisation Fertilisation is the union of an ovum and a spermatozoon. When they unite, they form a zygote . There are two types: External <ul><li>It’s the union of gametes which occurs outside the female’s body. </li></ul><ul><li>It’s typical of: </li></ul><ul><li>Aquatic animals </li></ul><ul><li>Amphibians </li></ul><ul><li>Some insects </li></ul><ul><li>It’s the fusin of gametes which occurs inside the body of the female or hermaphrodite. </li></ul><ul><li>It’s typical of: </li></ul><ul><li>Most terrestrial animals </li></ul><ul><li>Some fish </li></ul>Internal
  5. 5. Embryonic development It is the process that goes from the formation of the zygote to the birth of a new individual. Depending on where it takes place, animals are classified as: Viviparous Ovoviviparous Oviparous An animal, fish, bird etc that is oviparous produces eggs that develop outside its body. In viviparous animals, the embryo develops inside the female body. In ovoviviparous animals, the embryo develops inside an egg which remains inside the female’s body. Dolphin inside her mum’s womb Hen incubating her eggs Eggs inside a shark
  6. 6. <ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li>http :// /ans02/ chapters /chap051. html </li></ul><ul><li>http :// /dog- pictures / </li></ul><ul><li>http :// /2008/12/ duck - duck - deer / </li></ul><ul><li>http :// / stock_photos /NAN7745. php </li></ul><ul><li> </li></ul><ul><li>http :// /2300-11395_3-6141187-4. html </li></ul><ul><li>http :// pet - /more- pet - snakes / common - terms / oviparous </li></ul><ul><li>http :// www.come - home - to - / hen.php </li></ul><ul><li>http :// / shark / english / reproduction.htm </li></ul>References