ANIMAL REPRODUCTION FOR SENIOR HHIGH SCHOOL.pptx

how animals reproduce

1. ANIMAL REPRODUCTION

2. Why Do Animals Reproduce? To continue their species To maintain ecological balance To adapt and survive in changing environments 2

3. Types of Animal Reproduction Sunday, January 31, 20XX Sample Footer Text 3

4. Sexual Reproduction

5. 5 • Involves fusion of male and female gametes • Produces genetically unique offspring • Can occur through: External fertilization (e.g., fish, amphibians) Internal fertilization (e.g., birds, mammals)

6. External Fertilization 6 Fertilization occurs outside the body Common in aquatic animals Eggs and sperm released into water Examples: Fish, frogs

7. Internal Fertilization 7 Fertilization occurs inside the female’s body Offers more protection to the embryo May result in egg-laying or live birth Examples: Birds, reptiles, mammals

8. MODES OF SEXUAL REPRODUCTION 8

9. 9 METHOD DESCRIPTION EXAMPLE ANIMALS Oviparity Eggs laid outside the body Birds, reptiles Ovoviviparity Eggs hatch inside the body Some snakes, shark Viviparity Live birth; embryo develops in uterus Mammals (e.g., humans)

10. TYPES OF ASEXUAL REPRODUCTION 10 METHOD DESCRIPTION EXAMPLE ANIMALS BUDDING New organism grows from parent Hydra FRAGMENTATION Body breaks into parts that regrow Starfish, flatworms PARTHENOGENESIS Offspring from unfertilized egg Some insects, lizard

11. Thank you