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Questions and Answers
How do chicks develop in hens after fertilization?
The zygote divides repeatedly and travels down the oviduct, forming protective layers around it. After the hard shell is formed around the developing embryo, the hen lays the egg. The embryo takes about 3 weeks to develop into a chick.
How does development of the chick take place inside the egg?
The hen sits on the eggs to provide sufficient warmth, and the development of the chick takes place inside the egg during this period.
What is the difference between animals undergoing internal fertilization and external fertilization in terms of embryo development?
In animals undergoing internal fertilization, the development of the embryo takes place inside the female body, while in animals undergoing external fertilization, the development of the embryo takes place outside the female body within egg coverings.
What is the stage of the embryo when all body parts can be identified called?
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What is the difference between viviparous and oviparous animals?
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Study Notes
Chick Development
- After fertilization, a hen's egg develops into a chick through a series of stages inside the egg
- Development begins with cleavage, where the zygote divides into multiple cells
- The embryo forms a blastoderm, which consists of three primary germ layers: ectoderm, endoderm, and mesoderm
- Gastrulation occurs, where the blastoderm undergoes a series of complex cellular movements to form the three primary germ layers
- Organogenesis follows, where the three primary germ layers differentiate into specific organs and tissues
Embryo Development Comparison
- Internal fertilization occurs in animals where sperm fertilize eggs inside the mother's body, and the embryo develops inside the mother until birth
- External fertilization occurs in animals where sperm fertilize eggs outside the mother's body, and the embryo develops outside the mother's body
- In internal fertilization, the embryo receives nourishment from the mother's bloodstream, whereas in external fertilization, the embryo relies on the yolk sac for nourishment
Embryonic Stage
- The stage of the embryo when all body parts can be identified is called organogenesis
Reproductive Strategies
- Viviparous animals give birth to live young, such as mammals, and nourish their embryos with a placenta and umbilical cord
- Oviparous animals lay eggs outside their bodies, and the embryos develop outside the mother's body, such as birds and reptiles
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Description
Test your knowledge on embryo and foetus development with this quiz. Learn about the stages of development and how different species give birth.
