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In human SEX DETERMINATION, the FATHER contributes:
AAlways an X chromosome to the child
BAlways a Y chromosome to the child
CEither X or Y chromosome with 50% chance each
DTwo X chromosomes always to a girl child
Answer & Solution
Correct answer: C. Either X or Y chromosome with 50% chance each
The father (XY) contributes either an X or a Y to each child, with 50% probability. The mother (XX) always contributes X. Thus, X (from father) + X (mother) = girl (XX); Y (from father) + X (mother) = boy (XY).
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