🧬 Sex chromosome combinations — easy genetics! 👩 female → XX 👨 male → XY 🔹 mother: always contributes X 🔹 father: contributes X or Y 🧬 possible combinations: X X → XX → female 👧 X Y → XY → male 👦 📌 important: the ovum carries X, while sperm carries either X or Y. Therefore, the sperm determines whether the embryo receives an X or Y chromosome. ⚡ quick revision: XX = female | XY = male mother = X | father = X/Y 📚 study tip: remember “mother gives X, father gives X or Y.” ⚠️ Chromoso
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