Hello everyone, if you still don’t know much about what in vitro fertilization means, it doesn’t matter. Today, this site will share with you the knowledge about what in vitro fertilization means and what it includes. It is called internal fertilization, external fertilization, why amphibians are outside the body, insects are outside the body, and birds are inside the body. The problems will be analyzed for everyone. I hope it can solve everyone\’s problems. Let\’s get started!
Contents of this article
- Is insect fertilization in vitro
- What is internal fertilization and external fertilization? Why are amphibians fertilized externally, insects and birds fertilized internally?
- Those categories What is the difference between animals that are fertilized in vitro and animals that are fertilized internally
- Fish are fertilized in vitro
- What are homologous and heterologous
- Is the egg laid by internal fertilization or external fertilization
1. Do insects undergo external fertilization
1. Internal fertilization: higher animals Such as reptiles, birds, mammals, some molluscs, insects, some fish and a few amphibians.
2. In vitro fertilization: a common reproductive method for aquatic animals, such as some fish and some amphibians.
2. What is internal fertilization and external fertilization? Why are amphibians fertilized outside the body, insects and birds fertilized inside the body?
1. Internal fertilization: higher animals such as reptiles, birds, mammals, some mollusks, insects, some fish and a few amphibians.
2. In vitro fertilization: a common reproductive method for aquatic animals, such as some fish and some amphibians.
3. What are the differences between which animals are fertilized externally and which are fertilized internally
Which types of animals are fertilized externally and which are fertilized internally? What are the differences? In vitro fertilization: invertebrates, fish and amphibians. Internal fertilization: many insects, reptiles, birds and mammals.
4. Fish are fertilized in vitro
1. Reproduction of fish The methods can be summarized as follows: oviparous, ovoviviparous, and viviparous.
2. 1. Oviparous parent fish directly lay mature eggs in the water for fertilization and development. Fertilized outside the body, they develop in water until they hatch into small fish. Most fish are of this type. Most of the eggs laid by the broodstock are not protected and may be eaten in large quantities by various enemies, so they lay more eggs. For example, carp and crucian carp produce hundreds of thousands of eggs every year, sunfish spawn up to 300 million eggs, and some sharks and rays also lay eggs.
3. 2. The eggs of ovoviviparous fish are fertilized in the female fish. The fertilized eggs develop in the reproductive tract and have little nutritional connection with the mother. Like many sharks that reproduce this way, marine crucian carp and a very small freshwater mosquito fish also produce ovoviviparous eggs. During the development process, the nutrients required by the embryo are completely supplied by the egg itself, just like ovoviviparous. Ovoviviparous is more advanced than oviparous, because fertilization and development in the body are safer and are not affected by changing external factors, which can better protect offspring. . 3. True viviparous birth. Among fish, only a few cartilaginous fishes, such as gray sharks and sharks, are fertilized and developed in the body. This type of reproduction is a step further than ovoviviparous. The developing embryo and the mother pass through the blood. Circulation is supplied, and the place where the mother raises the young fish also changes, resulting in a placenta-like structure similar to that of mammals, but there is a big difference, so it is called pseudoviviparous. To show the difference from true viviparous mammals.
5. What are hermaphrodites and heterosexuals
1. Hermaphroditism is Antonym of dioecy. That is, a phenomenon in which both female and male traits are obvious in an organism. Hermaphroditism means that an animal has glands of both sexes at the same time. Usually only refers to a normal phenomenon, which is different from phenomena such as intersex and male-female mosaicism. Plants also have hermaphroditism.
2. Dioecy refers to the phenomenon that the male and female reproductive organs of the same species of animals are born in different individuals, which is called dioecy. Jellyfish, schistosomiasis, squid, etc. are dioecious animals, and generally vertebrates are dioecious animals. In dioecious plants and dioecious animals, the chromosomes that determine sex or affect the differentiation of sexual organs are called sex chromosomes, and the rest are autosomes.
3. Allogeneic fertilization is the counterpart of autofertilization, also known as cross fertilization. Generally refers to hermaphroditeInvertebrates need to exchange sperm from different individuals to be fertilized.
4. Isofertilization, that is, self-fertilization. It means selfing, which means that two sets of chromosomes born from the same pronucleus fuse with each other and fertilize in one cell. Also known as self-mating and homologous nuclear union.
5. Most aquatic animals use in vitro fertilization, that is, the female and male individuals release eggs and sperm into the water respectively to combine naturally. Most terrestrial animals undergo internal fertilization, that is, sperm is directly injected into the female body. Internal fertilization can also be found in some fish and aquatic animals.
6. Cross-fertilization is formed by combining the genetic material of two parents, so it can cause organisms to mutate in a wider range for natural selection to take effect. function, thereby improving the ability of species to adapt to environmental changes.
6. Is the egg laid by internal fertilization or external fertilization
1 , because fertilization of animals such as birds and reptiles is completed in the body. The specific process is: after the female animal ovulates, the folds (slates) formed between the fallopian tube and the ovary fix the egg. At this time, the sperm of the male animal is paired. The organ enters the female animal\’s body, combines with the egg to complete fertilization, and then the egg is expelled from the body.
2. There are two modes of reproduction related to egg laying methods, namely ovoviviparous and viviparous.
3. Ovoviviparous means hatching inside the egg shell. After hatching, the larvae will continue to develop in the egg shell until a certain stage before breaking out; while viviparous means hatching inside the egg shell. After the embryo develops to a certain level, it lacks the egg shell and absorbs nutrients directly from the mother to complete its growth and development.
4. Different reproduction methods adapt to different environments and species characteristics, which is also one of the manifestations of natural ecological balance.
The sharing of what does in vitro fertilization refers to and what is internal fertilization and why amphibians are outside the body in insects and birds are inside the body ends here. , we will be very happy if your problem is solved.
