How is the equal genetic contribution of male and female parents ensured in progeny ?
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There are total 23 pairs of chromosomes in both male and female parents but in their respective germ cell only a single set of chromosomes participate in the fertilization process. Thus during fertilisation both male and female contribute a single set of chromosomes and restore the original number of chromosomes in their progeny.
Hope this helps
A zygote thus gets 50 % of DNA from each parent as far as somatic cell DNA is concerned.
Thus the equal genetic contribution is ensured from male and female parents..
Hope it's too simple to understand well.
Thanks.