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10-Jun-2019 18:59

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One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process.Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms.However, no third gamete type is known in multicellular plants or animals.the origin of chromosomal sex determination may have been fairly early in eukaryotes (see evolution of anisogamy).Physical differences are often associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.We're happy to know people are starting to see the true value of #proofofstake crypto network that is fair, secure and sustainable!

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This mode of reproduction is called asexual, and it is still used by many species, particularly unicellular, but it is also very common in multicellular organisms, including many of those with sexual reproduction.

Among humans and other mammals, males typically carry an X and a Y chromosome (XY), whereas females typically carry two X chromosomes (XX), which are a part of the XY sex-determination system. Other animals have different sex-determination systems, such as the ZW system in birds, the X0 system in insects, and various environmental systems, for example in crustaceans.

Fungi may also have more complex allelic mating systems, with sexes not accurately described as male, female, or hermaphroditic.

The defining characteristic of sexual reproduction in eukaryotes is the difference between the gametes and the binary nature of fertilization.

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Multiplicity of gamete types within a species would still be considered a form of sexual reproduction.Individual organisms which produce both male and female gametes are termed hermaphroditic.