how are equal contribution of male and female parents ensured in progeny
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Equal genetic contribution of male and female parents ensured in the progeny is ensured during sexual reproduction, where a unipoloid female gamete fuses with a uniploid male gamete to produce a zygote, which is diploid and gives rise to the progeny. The female gamete contais 23 chromosomes and the male gamete also contains 23 chromosomes. So the zygote that is formed contains a full normal set of 46 chromosomes.
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How are equal genetic contribution of male and female parents ensured in the progeny?
During the formation of gametes as a result of reductional division (meiosis), sperms - XY & eggs - XX receive only single genome of a parent.
When fertilization occurs, one genome each from sperm & egg reaches the zygote.
It means both male & female parents contribute exactly equal amount of genetic material to the offspring.
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