Hello everyone, today I will share with you some knowledge about embryonic development. It will also explain the difference between ontogeny and embryonic development. The article may be too long. If you can solve it by chance For the problems you are facing now, don’t forget to pay attention to this site and get started now!
Contents of this article
- The difference between ontogeny and embryonic development
- Discuss the process of fish embryonic development
- What three types of animal early embryonic development include
- What are the basic processes of animal embryo development
- Insect embryo What is the development method
- What does animal embryonic development generally include and mesoderm generation
1. The difference between ontogeny and embryonic development
Ontogeny refers to the development of children in nature Development
2. Discuss the development process of fish embryos
1. The embryonic development of fish can be divided into two stages: pre-embryonic development and post-embryonic development, with the boundary before and after the embryo hatching. Also called early development.
2. Preembryonic development occurs within the egg membrane. It gradually develops from a fertilized egg into a mobile larvae, and finally hatches after breaking through the egg membrane. This period is often It\’s called incubation.
3. Postembryonic development refers to the period from hatching to the time when it can start to take in external nutrients or until the differentiation of major organs.
4. Three major stages: cleavage stage, embryonic body formation stage, and organ differentiation stage
5. Within the appropriate temperature range, the lower the water temperature, the slower the development.
6. The four major fish species are sensitive to temperature changes before and after the blastopore closing period
7. Hypoxia often causes embryos to hatch early. On the contrary, increasing oxygen saturation willInhibit hatching.
8. Within the range of normal oxygen content, the higher the oxygen content, the more normal embryos will hatch.
3. What three types of early embryonic development include
Although There are many types of animals, but the development of embryos still has similar processes, which can be divided into stages such as fertilization, cleavage, morula, blastocyst, gastrulation and organ formation.
4. What are the basic processes of animal embryonic development
1. In addition to the common stages of invertebrate embryonic development such as cleavage, blastocyst, gastrulation, larvae and adult organogenesis, some also have a transition called post-larval stage after the larval stage and before entering the adult stage. For example, the post-larval stage of shrimps has all the appendages, but has not yet reached the adult level in terms of body proportions, appendage lengths and external reproductive organs.
2. Another example is that the post-larval stage (big-eyed larvae) of crabs has the same cephalothorax as the adult, but the wide abdomen has not yet been bent underneath.
3. The embryonic development of vertebrates can be divided into stages such as fertilization, cleavage, morula, blastocyst, gastrulation and organ formation.
4. In addition, during the embryonic development of vertebrates, characteristics common to various animals will appear first (such as skin), and then specializations will gradually develop. structure (such as fish scales), and more complex species are initially quite similar to more primitive species, and then slowly increase in variation over time.
5. What is the development method of insect embryos
1. Embryo Development refers to the entire process from the zygotic cleavage of a single cell to the development of an embryo with complete internal and external organs and preparation for hatching.
2. Insect cleavage includes two methods: complete cleavage and superficial cleavage.
3. 1. All substances in the surface cleavage egg divide unevenly. Cell division mainly occurs in the outer layer of the egg. This kind of eggThe method of cleavage is called surface cleavage. This type of cleavage occurs in insects with a large yolk, and most insects fall into this category.
4. 2 Complete cleavage The cleavage method in which all the material in the egg is divided into two roughly equal daughter cells is called complete cleavage. This type of cleavage occurs in insects with a small yolk, and Collembola and some parasitic Hymenoptera belong to this type.
6. What does animal embryonic development generally include and the occurrence of mesoderm
Animal embryonic development generally includes the following three germ layers: ectoderm, mesoderm and endoderm. Mesoderm is an important stage in embryonic development. Its main processes are:
1. Gastrula development: a cavity is formed inside the original embryo. It is called the archenteron or archenteron cavity. The archenteron is formed from the archenteron buds and eventually develops into parts of the digestive system such as the esophagus, stomach, small intestine, and large intestine.
2. Formation of the heart and vascular system: Cells in the archenteron differentiate to form the heart and vascular system. The heart-forming region in the mesoderm begins to contract and spontaneously forms the heart tube, which eventually develops into a complete heart.
3. Bone, muscle and urinary system formation: The cell types contained in the mesoderm differentiate into precursor cells of the bone, muscle and urinary system. These cells migrate and differentiate to form various tissues of the bone, muscle, and urinary systems.
Overall, mesodermogenesis plays a crucial role in the development of animal embryos and participates in the formation and differentiation of multiple organ systems.
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