How is the equal genetic contribution of male and female parents in short in progany ?
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In human beings, equal genetic contribution of male and female parents is ensured in the progeny through inheritance of equal number of chromosomes from both parents. There are 23 pairs of chromosomes All human chromosomes are not paired. Out of these 23 pairs, the first 22 pairs are known as autosomes and the remaining one pair is known as sex chromosomes represented as X and Y. Females have a perfect pair of two X sex chromosomes and males have a mismatched pair of one X and one Y sex chromosome.
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How is the 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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