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Added: 8 months ago
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December 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 sex is determined at fertilization system of embryo at 7 weeks Genetic sex. Embryo with XY sex chromosomes. Sex-determining region of. Dec 8, Typically, human females have two X chromosomes while males possess an XY pairing. This XY sex-determination system is found in most. The system of chromosomal sex determination is even further reduced in certain Thus, XX, XXY, and XXYY flies are females, while XY and XO flies are males...the end of the story look at the video above ↑ ↑ ↑

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