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How is the equal genetic contribution of...

How is the equal genetic contribution of male and female parents ensured in the progeny?

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During sexual reproduction, a female gamete or egg cell which are haploid form z​y​gote. Z​yg​ote is diploid which contains 23 chromosomes from mother and 23 from father. In this way an equal genetic contribution of male and female parents is ensured in the progeny.
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