Sexual reproduction involves the combining and mixing of genetic traits. specialized cells known as gametes combine to form offspring that inherit traits from each parent. Gametes can be identical in form and function, but, in many cases, an asymmetry has evolved. In animals, there are four sex determination systems, which depend on the binary nature of fertilization. In multicellular plants, no third sex determination system is known, but it would still be considered a form of sexual reproduction.
About Sex in brief
Sexual reproduction involves the combining and mixing of genetic traits. specialized cells known as gametes combine to form offspring that inherit traits from each parent. Gametes can be identical in form and function, but, in many cases, an asymmetry has evolved. Physical differences are often associated with the different sexes of an organism. These sexual dimorphisms can reflect the different reproductive pressures the sexes experience. Sexual reproduction first probably evolved about a billion years ago within ancestral single-celled eukaryotes. Some bacteria use conjugation to transfer genetic material between cells; while not as sexual as sexual reproduction, this also results in the same mixture of traits. In animals, there are four sex determination systems, which depend on the binary nature of fertilization. In multicellular plants, no third sex determination system is known, but it would still be considered a form of sexual reproduction. While there are no known sex-determination systems in plants, animals or fungi, the origin of chromosomal sex determination may have been fairly early. The reason for the evolution of sex, and the reason it has survived to the present, is still matters of debate. Some of the many plausible theories include that sex creates variation among offspring, sex helps in the spread of advantageous traits, and that sex facilitates repair of germ-line DNA. In complex organisms, the sex organs are the parts that are involved in the production and exchange of gametees. Many species, both plants and animals, have sexual specialization, and their populations are divided into male and female individuals.
There are also species in which there is no sexual specialization and the same individuals both contain masculine and feminine reproductive organs, and they are called hermaphrodites. This is very frequent in plants and fungi, but not in animals or plants. The defining characteristic of sexual reproduction is the difference between the gamete types within a species, which depends on the nature of the fertilization process. The sex organs of animals and plants are called sex organs and can be found in many species, such as birds, insects, and crustaceans. The sexes of fungi and plants can be more complex, with sexes not accurately described as male, female, or hermAPHroditic. The same sex organs can also be used in complex organisms such as plants, fungi and insects, which have different sex organs that are used in sexual reproduction of the same species. The sexual organs of these organisms can be used to distinguish between males and females, and between male and females. This can lead to the creation of different sex-specific sex organs, which can be seen in some species of plants. In plants, this is known as the prokaryote stage, or the early stage of sex determination, which dates to the early prokARYote stage of life. In fungi, this stage is called the early stages of sexual determination, and it may have fairly early origins in the early eukARYotes. It is also very common inmulticellular organisms, including many of those with sexual Reproduction is an aspect of this process.
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This page is based on the article Sex published in Wikipedia (as of Dec. 10, 2020) and was automatically summarized using artificial intelligence.
