what are chromosomes?
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Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA). Passed from parents to offspring, DNA contains the specific instructions that make each type of living creature unique.
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The Y chromosome is one of two sex chromosomes in therian mammals, including humans, and many other animals. The other is the X chromosome.
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