L17 animal reproduction

L17 animal reproduction - Chapters 51 & 52 Lecture...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapters 51 & 52 Lecture Guide Asexual Reproduction Common in many invertebrates Types Fission: e.g., anemones, Planaria, coral Budding: e.g., hydra, anemone Fragmentation/regeneration: e.g. sea stars Internal budding (gemmules): e.g., sponges Two from one: Fission of a sea anemone ( Anthopleura elegantissima ) Fission in Planaria Hydra Budding Fragmentation/Regeneration of Sea Stars Gemmules Parthenogenesis Asexual reproduction by the females of some species Involves the development of offspring from an unfertilized haploid egg E.g., honey bees, whiptail lizards Sexual Reproduction: Variations Hermaphrodites Single individuals produce both sperm and eggs sessile (immobile) hard to find a mate, e.g., pond snails and tapeworms Some self-fertilize, but most must mate with another, e.g., earthworms Sequential hermaphrodites (can change gender) e.g. .bluehead wrasse Sexual Reproduction: External Fertilization Joining of egg and sperm outside the body Release of egg and sperm usually happens in water, so the sperm can swim to the egg Most species live always in the water Some, like the frog, may live around the water on land, but they must return to the water to mate
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

L17 animal reproduction - Chapters 51 & 52 Lecture...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online