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| Sexual Reproduction |
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| Sexual reproduction involves the formation and fusion of special sex cells called gametes. It is a complex process. |
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 Two different sexes i.e., male and female take part in the process. |
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 Testis in male produces the male gametes or sperms and the ovary in female produces female gametes or ova. |
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 Gametes are formed by meiosis or reduction division and so are haploid in nature. |
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 Sperms are motile and move towards ovum for fertilisation. |
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 Sperms and ova come into contact with each other and fuse to form a zygote or egg by a process called fertilisation. |
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 It involves slow multiplication. |
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 Variations appear due to new combinations of genes during crossing over. |
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 Daughter organisms or offsprings are genetically different from the parents. |
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 The diploid zygote then divides by mitosis and passes through different develomental phases to transform into a multicellular individual. |
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