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44.1 Early Developmental Stages
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- Development begins when a sperm fertilizes an egg.
- The first stages of embryonic development in animals lead to the establishment of the embryonic germ layers.
- The presence of yolk affects the manner in which animal embryos go through the early developmental stages.
- In vertebrates, the nervous system develops above the notochord after formation of a neural tube.
| - What is fertilization?
Answer - What happens at the surface of an egg once fertilization has occurred that prevents the penetration of other sperm?
Answer - Cell division without cell growth in the embryo is called _________________.
Answer - What is the difference between morula and blastula stages?
Answer - How do endoderm and ectoderm develop and during what stage does this occur?
Answer - From which tissue layers are the notochord and nervous systems of vertebrates derived?
Answer
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Essential Study Partner
Summaries of major points- Fertilization
- Embryonic development
- The effect of yolk
- Neurulation and the nervous system
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44.2 Developmental processes
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- Cytoplasmic segregation and induction help bring out cellular differentiation and morphogenesis.
- Development genetics has benefited from research into the development of Caenorhabditis elegans, a roundworm, and Drosophilia melanogaster, a fruit fly.
- Homeotic genes are involved in shaping the outward appearance of animals.
| - What are cellular differentiation and morphogenesis?
Answer - The ability of one embryonic tissue to affect the development of another is called ____________.
Answer - What is apoptosis and how does it function in development?
Answer - What is the function of homeotic genes?
Answer
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Essential Study Partner
Summaries of major points- Development requires growth, differentiation, and morphogenesis
- Induction
- Model organisms
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44.3 Human embryonic and fetal development
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- Humans, like chicks, are dependent upon extraembryonic membranes that perform various services that contribute to development.
- During the embryonic period of human development, all systems appear.
- Humans are placental mammals; the placenta is a unique organ where exchange between fetal blood and mother's blood takes place.
- During fetal development, the fetus grows large enough to live on its own. Birth is a multistage process that includes delivery of the child and the extraembryonic membranes.
| - What occurs during the embryonic and fetal periods of development?
Answer - What produces human chorionic gonadotropin and what does it do?
Answer - During what week of development do limb buds appear?
Answer - What is the function of the placenta?
Answer
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Essential Study Partner
Summaries of major points- Development covers events from fertilization to parturition
- Human development is divided into...
- Extraembryonic membranes
- Embryonic development
- Structure and function of the placenta
- Fetal development and birth
- Stages of birth
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