explain how an XXY individual can arise in human beings??? - for 2 marks
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A person of the genotype XXY is a classic example of Klinefelter Syndrome. The biological sex of the person is male (due to presence of a Y chromosome) but there is hypogonadism and lack of secondary sexual characters due to lack of testosterone or testosterone insensitivity.
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Explanation:
It's also called XXY because they have an extra X chromosome in most or all of their cells. Usually, a person has 46 chromosomes in each cell, divided into 23 pairs, which includes two sex chromosomes The disorder is a random error in cell division that happens when a parent's reproductive cells are being formed
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