There are two ways to do reproduction.
First one can be done by singe organism, but second one needs two organisms to be done.
Asexual reproduction
This is the reproduction that takes places by one organism.
How?
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Fission The most initial form of reproduction : it divide its body into to part, and continue mitosis to grow. So, we can’t identify parent and offspring
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Budding Parent organism produces pudding, which is produced by mitosis, and release this part. This divided budding becomes new organism
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Spore formation Discharge spore to reproduce
So, in every asexual reproduction only mitosis is occurred. Number of chromosome does not change
Sexual reproduction
Female and male gametes meet to produce to arrange of chromosome.
Meiosis occur