Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop...
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Transcript of Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop...
![Page 1: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/1.jpg)
Development and Growth
![Page 2: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/2.jpg)
Where Do Embryos Develop?
• Growing offspring, or the embryo, may develop outside or inside of the parent’s body.
• The offspring of some animals develop inside an egg laid outside of the parent’s body.
• Most animals without backbones lay eggs.• The eggs of land vertebrates such as reptiles
and birds, that develop in an egg outside of the parent’s body are called amniotic eggs.
![Page 3: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/3.jpg)
Amniotic Egg
![Page 4: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/4.jpg)
Egg Retaining Animals
• In some animals, an embryo develops inside an egg that is kept within the parent’s body.
• The developing embryo gets all of its nutrients from the egg’s yoke.
• What are some egg-retaining mammals that you can think of?
![Page 5: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/5.jpg)
Placental Mammals
• In placental mammals the embryo develops inside the mother’s body.
• What are some examples of placental mammals?
• Materials are exchanged between the embryo and the mother through an organ called the placenta.
![Page 6: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/6.jpg)
Placental Mammals
• Blood carrying food and oxygen from the mother flows to the placenta and then the embryo.
• Blood carrying wastes and carbon dioxide from the embryo flows to the placenta and then to the mother.
• The mother’s blood does not mix with the embryo’s blood and the placental mammal develops inside the mother’s body until its body systems can function on their own.
![Page 7: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/7.jpg)
Placental Mammals
![Page 8: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/8.jpg)
How Do Young Animals Develop?
• Some animals look like small versions of adults.
• Other animals go through a process of metamorphosis, or major body changes, as they develop from young organisms into adult organisms.
• What are some examples of animals that undergo metamorphosis?
![Page 9: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/9.jpg)
Crustaceans
• Most crustaceans such as lobsters begin their lives as tiny, swimming, larvae that do not resemble adults.
• Through metamorphosis, crustacean larvae develop into adults.
![Page 10: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/10.jpg)
Insects
• Insects undergo complete or incomplete metamorphosis.
![Page 11: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/11.jpg)
Complete Metamorphosis
• Complete metamorphosis had 4 stages: egg, larva, pupa, and adult.
• In the pupa stage the insect is enclosed in a protective covering and major changes in body structures are taking place.
• The pupa does not eat and moves very little.
![Page 12: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/12.jpg)
Incomplete Metamorphosis
• Incomplete metamorphosis has no distinct larval stage and has 3 stages: egg, nymph, and adult.
• An egg hatches into a nymph which usually looks like an adult without wings.
• As the nymph grows it may shed it’s exoskeleton several times.
![Page 13: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/13.jpg)
Amphibians
• Amphibians such as frogs begin their life cycles as fertilized eggs in water.
• The larva of a frog is called a tadpole.
• The frog undergoes metamorphosis to become an adult.
• Does a frog go through complete or incomplete metamorphosis?
![Page 14: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/14.jpg)
How Do Animals Care For Their Young?
• Most amphibians and reptiles do not provide parental care, while most birds and mammals typically care for their offspring.
• Offspring that do not receive parental care must be able to care for themselves from their time of birth.
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Parental Care
• Most bird species lay their eggs in nests that one or both parents build.
• Some species can move around and find food right after they hatch while others are helpless and must be fed by the parent.
• Most parent birds feed and protect their young until they are able to care for themselves.
![Page 16: Development and Growth. Where Do Embryos Develop? Growing offspring, or the embryo, may develop outside or inside of the parent’s body. The offspring.](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d095503460f949db930/html5/thumbnails/16.jpg)
Parental Care
• Most mammals are usually quite helpless for a long time after they are born.
• All young mammals are fed with milk from the mother’s body and one or both parents may continue caring for their offspring until the young animals are independent.