down syndrom and turner syndrome occur in human beings due to:
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A number of genetic alterations are possible in TS. Monosomy: One X chromosome is completely missing. Experts believe this is caused by an error either in the father's sperm or the mother's egg. Every cell in the offspring's body has one X chromosome missing.
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Presence of full or partial extra three copies of chromosome 21 causes Down's syndrome. Hence, it is trisomy 21 and is represented as 45 +XY or 45+XX. Absence of one X-chromosome causes Turner's Syndrome which is represented as 44 +XO and is a monosomic condition.
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