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The sex chromosomeDecember 8, Females have two X chromosomes; males have an X chromosome and a Y chromosome. National Library of Medicine Chromosomes are thread-like molecules that carry hereditary information for everything from height to eye color. They are made of protein and one molecule of DNA, which contains an organism's genetic instructions, passed down from parents. In humans, animals, and plants, most chromosomes are arranged in pairs within the nucleus of a cell. Humans have 22 of these chromosome pairs, called autosomes.Chromosomal basis of sex determination. X and Y chromosomes, X-linkage. Humans have 22 chromosome pairs and two sex chromosomes. Females have two X chromosomes; males have an X chromosome and a Y. Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female. The sex chromosomes of human beings and other...the end of the story look at the video above ↑ ↑ ↑

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