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10TH CLASS BIOLOGY REPRODUCTION

  10TH CLASS BIOLOGY 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.In asexual reproduction, an organism can reproduce without the 
involvement of another organism. Asexual reproduction is not limited to single-celled organisms. The cloning of an organism is a form of asexual reproduction. By asexual reproduction, an organism 
creates a genetically similar or identical copy of itself. The evolution of sexual reproduction is a 
major puzzle for biologists. The two-fold cost of sexual reproduction is that only 50% of organisms 
reproduce and organisms only pass on 50% of their genes.Sexual reproduction typically requires the 
sexual interaction of two specialized organisms, called gametes, which contain half the number of 
chromosomes of normal cells and are created by meiosis, with typically a male fertilizing a female of 
the same species to create a fertilized zygote. This produces offspring organisms whose genetic 
characteristics are derived from those of the two parental organisms.

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