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The X and Y chromosomes, commonly referred to as the sex chromosomes, are one such pair. They determine the biological sex, reproductive organs, and sexual characteristics that develop in a person.

For the 3's SUV sibling, the Model Y compact crossover, the internal nickname is "Juniper." Whatever you call the new Y, it marks a huge step forward for Tesla's global best seller—not only ...

Erika Maldonado will lead Spanish-language outreach to taxpayers for the Office of Cook County Treasurer Maria Pappas. Maldonado has strong connections throughout the Chicago-area Latino community.