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How do transfer of germ cells occur betw...

How do transfer of germ cells occur between two individuals for sexual reproduction ?

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The sexual mode of reproduction involves fusion of germ cells from two individuals. This can happen by either of following:
(1) The external release of poller grains from anther of flowering plants and gametes from the males or external fertilisation of male and female gametes as in frogs.
(2) It can happen by two individuals joining their bodies together for internal transfer of germ cells for fusion, e.g., internal fertilisation as seen in many animals.
The actual transfer of male germ cells into female body in case of internal fertilisation needs special organs for the sexual act, such as penis.
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