The X chromosome, being larger, carries many more genes than does the Y.
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Development of the reproductive organs.
If the father's sperm is carrying a Y-chromosome, the child will be male.
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The Editors of Encyclopaedia Britannica.
Sex chromosomeeither of a pair of chromosomes that determine whether an individual is male or female.
The effects of genes carried only on the Y chromosome are, of course, expressed only in males.