In animal kingdom, there are two different types of reproduction. Each of them has distinct characteristics, which offer assistance to recognize between species.
All these types of reproduction involve various processes to create an offspring.
Sexual reproduction is a method of reproduction in which the living beings are created by combining the hereditary data from two individuals of distinctive genders. The male and female gametes are combined through fertilization to form a zygote.
The zygote will develop in a series of steps to create a unique and fully developed organism.
Fertilization: It is the fusion of male and female gametes, that is, sperm and ovum. In animals, two different types of fertilization can happen; they are internal and external fertilization.
Internal fertilization: It is the fusion of egg and sperm inside the female reproductive system during sexual reproduction. Example: humans.
External fertilization: It mostly occurs in aquatic animals. The fusion of gametes takes place outside the body of the organism. Example: fishes and amphibians.
Based on the development of embryo, animals are further classified into two different groups.
Viviparous animals: In these animals, fertilization and embryo development take place inside the body and they give birth to fully-developed young ones.
Viviparous animals reproduce by giving birth to young ones, which are fed by the secretions of the mammary glands.
The progeny of both viviparous and oviparous creatures are developed from fertilized eggs, but the eggs of viviparous creatures need a difficult external covering or shell like the chicken egg.
Viviparous offspring develop within the mature female till they become capable of surviving on their own, exterior to her body.
In many species, the developing fetuses of viviparous animals are associated with a placenta within the motherâ€™s body. A placenta is a unique membranous organ with blood supply and it outlines the uterus of the pregnant warm-blooded mammals. It gives food to the developing embryo via a supply line called as umbilical cord. The duration between fertilization and the birth of a viviparous individual is called its gestation period.
All warm-blooded animals except echidnas and platypus are viviparous. Platypus and echidnas are called monotremes because they lay eggs. The exceptional viviparous animals include some insects, few reptiles and the snakes such as the Fastener wind. Ocean roost, a few sharks, and a couple of well-known aquarium fish such as guppies and mollies are also viviparous.
The fertilization of the oviparous animals takes place inside the body and the fertilized egg is conveyed out of the body for the embryonic development. The yolk regions supply the nutrition and energy and the albumin supplies the required water for the development of the offspring.
Oviparity involves internal fertilization followed by the continuous release of the individuals into the external environment for growth and development
The generation of numerous eggs increases their chances of survival and this way works as a methodology for regenerative wellness. The multiple numbers of eggs discharged in oviparity aids in maintaining a definite population of species. Examples of oviparous animals: frogs, snakes, lizards, hens, duck, fishes, and so forth.
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