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The life of a human being begins as a si...

The life of a human being begins as a single celled zygote. The information presents in the chromosomes in this cell is what determines the characteristics of this human being. Each cell in the body of a male contains one X chro mosome and one Y chromosome (XY).
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What are sex chromosomes?

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Sex chromosomes are chromosomes that determine whether the individual is male or female.
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