Alex-Uncasual

Author: Drunny

DNA is made up of four base chemicals, adenine, guanine, cytosine and thymine. These pair with each another to form a double-helix structure. DNA is passed down from parent to child through chromosomes. Each human cell has 46 chromosomes, half inherited from the mother and half from the father. Chromosomes and the DNA they contain make it possible to determine someone's genetic lineage.
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Language: en

Genres: Health & Fitness, Sexuality

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