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This video explains how the gender of child can be determined in three ways
three in detail
Why a child of a particular gender (either male or female) is continuously born in a family for generations.
There is a theory that only male child borns more than female kids, whenever there is a war. This theory is called Returning Soldier effect and is explained in detail the same way the scientist has described it.
If a man is born with many sisters or brothers, there is more possibility of having a female kid in the next generation.
Overall this video explains the role of alleles, mm & mf genes - how they determine the gender of a kid, how the gender can be find out by knowing the alleles and the family history.
Reference links - docs.google.co...
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