Sibling DNA test when putative siblings are males only:
Men have one Y chromosome and one X chromosome. Male offspring inherit the Y chromosome from their father and it remains unaltered throughout the paternal lineage. These male offspring will pass on their Y chromosome to their male offspring only.
Sibling DNA test when putative siblings are females only:
Women possess two X chromosomes which they pass on to their daughters. By taking this test you can determine a relationship between females of one lineage.
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