Question

which sex chromosomal combination in the zygote is responsible for the formation oftestes?​

Answer 1

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$\dashrightarrow$The male, being XY, can generate two types of sperm: half bear the X chromosome, half the Y. If the egg receives another X chromosome from the sperm, the resulting individual is XX, forms ovaries, and is female; if the egg receives a Y chromosome from the sperm, the individual is XY, forms testes, and is male.