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Biology of sexual reproduction

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Sexual reproduction is a process of biological reproduction by which organisms create descendants that have a combination of genetic material contributed by two different gametes, usually from two different organisms. A gamete is a mature reproductive or sex cell. Sexual reproduction results in increasing genetic diversity, since the union of these gametes produces an organism that is not genetically identical to the parent s. Sexual reproduction is characterized by two processes: meiosis , involving the halving of the number of chromosomes to produce gametes; and fertilization, involving the fusion of two gametes and the restoration of the original number of chromosomes.
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Reproduction, Types of sexual reproduction (Conjugation, Reproduction by sexual gametes)

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Sexual reproduction Definition and Examples | Biology Online Dictionary

Reproduction , process by which organisms replicate themselves. In a general sense reproduction is one of the most important concepts in biology : it means making a copy, a likeness, and thereby providing for the continued existence of species. Although reproduction is often considered solely in terms of the production of offspring in animals and plants, the more general meaning has far greater significance to living organisms. To appreciate this fact, the origin of life and the evolution of organisms must be considered. One of the first characteristics of life that emerged in primeval times must have been the ability of some primitive chemical system to make copies of itself.
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Asexual vs. Sexual Reproduction

Reproduction or procreation or breeding is the biological process by which new individual organisms — "offspring" — are produced from their "parents". Reproduction is a fundamental feature of all known life ; each individual organism exists as the result of reproduction. There are two forms of reproduction: asexual and sexual.
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Sexual reproduction is characterized by the process of meiosis, in which progeny cells receive half of their genetic information from each parent cell. Sexual reproduction is usually regulated by environmental events. In many species, when temperature, salinity, inorganic nutrients e. Sexual reproduction may immediately precede spore formation. Asexual reproduction is by binary or multiple fission schizogony.
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