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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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Name the two types of chromosomes.

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Humans and most other mammals have two sex chromosomes, the X and the Y. Females have two X chromosomes in their cells, while males have both X and a Y chromosome in their cells.
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