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Frog Reproduction

Frog Reproduction. zoology. Objectives. Explain how male frogs attracts females of the same species. Discuss the reproductive system of a frog. Describe the changes that occur during metamorphosis. Identify two examples of parental care in frogs. Courtship.

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Frog Reproduction

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  1. Frog Reproduction zoology

  2. Objectives • Explain how male frogs attracts females of the same species. • Discuss the reproductive system of a frog. • Describe the changes that occur during metamorphosis. • Identify two examples of parental care in frogs.

  3. Courtship • Each species has a call that is specific to that species. • Males call to attract a mate. • Air is driven back and forth from mouth to lungs to vibrate vocal cords. • Females respond only to males of the same species.

  4. Fertilization • When female approaches, the male climbs onto her back. • He grasps her firmly. This embrace is called an amplexus. • The female releases her eggs and the male deposits his sperm on top of them. • Direct external fertilization is achieved.

  5. Reproductive System • Male has two bean shaped testes located near the kidneys. • Sperm is passed from the testes in a tube and exits through the cloacal opening. • Female produces eggs in lobed ovaries near the kidneys. Eggs leave through the cloaca.

  6. Life Cycle • Eggs hatch into tadpoles within a few days of fertilization. • Tadpoles live off of the yolk of the egg for a few days until the mouth opens and gills are grown. • Metamorphosis begins.

  7. Metamorphosis • Hatchling tadpoles • Hind legs appear • Front legs appear • Tale disappears • Young Frog grows to adult size. • Controlled by the hormone thyroxine.

  8. Alternative methods • Lay eggs on land • Lay eggs in mucus • Bypass larval stage

  9. Parental Care • Increase the likelihood that offspring survive. • Male often remains with eggs to guard them. • Some males hold eggs in their mouth until they hatch. • Females gastric brood eggs.

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