Question

it is the contribution of father which determines the sex of a newborn . explain?

Answer 1

let's get to biology behind it -

The male parent does. Sex is determined by two chromosomes, X and Y. A female is XX, a male is XY. Since women completely lack the Y choromosome, they always contribute an X chromosome to the baby. The sex is determined by whether the sperm that fertilizes the egg is carrying another X or a Y.

Answer 2

father as XY chromosome
therefore when
Xcombine X then XX girl child will be born
and when
X combine with Y then XYa boy child is born
thus father chromosome decides the sex determination

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