Reproduction is the process by which organisms can replicate themselves. That is it is the process by which cells and organisms generate other cells and organisms of similar kind. Reproduction of organisms by the union of female and male reproductive cells is termed as sexual reproduction. Mostly unicellular and most multicellular organisms reproduce sexually. Reproduction, in which offspring are produced by a single parent, is termed as asexual reproduction. The fission (that is, splitting) of bacterial cells and the cells of multicellular organisms by mitosis is a type of asexual reproduction, as it is the budding of yeast cells and the generation of clones by the runners in plants. Most of the plants and fungi are capable of reproducing both sexually and asexually, as are some animals, like aphids and sponges.
In a common sense reproduction is one of the most significant concepts in biology: it means manufacture a copy, a likeness, and thus providing for the continued existence of species. However reproduction is frequently considered solely in terms of production of offspring in plants and animals, the more general meaning has far bigger significance to living organisms. To appreciate this reality, the origin of life and the evolution of organisms should be considered. One of the initial characteristics of life which emerged in primeval times should have been the ability of certain primitive chemical system to make copies of it.
At its lowest level, thus, reproduction is chemical replication. Since evolution progressed, the cells of successively higher levels of complexity should have arisen, and it was absolutely necessary that they had the capability to make likenesses of themselves. In unicellular organisms, the capability of one cell to replicate itself means the reproduction of a novel individual; in multicellular organisms, though, it means augmentation and regeneration. Multicellular organisms too reproduce in the strict sense of the term—that is, they build copies of themselves in the form of offspring—however they do so in a variety of manners, many comprising complex organs and elaborate hormonal methods.
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