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Statement I claims Down's syndrome is caused by the absence of one X-chromosome. This is incorrect. Down's syndrome is a chromosomal disorder caused by the presence of an additional copy of chromosome number 21 (Trisomy 21).
Statement II claims Turner's syndrome is caused by the presence of an additional copy of chromosomes. This is incorrect. Turner's syndrome is caused by the absence of one of the X-chromosomes (45, XO), resulting in a total of 45 chromosomes.
Since both statements provided in the question are factually incorrect based on the principles of human genetics, the correct choice is that both statements are incorrect.
Final Answer: Both Statement I and Statement II are incorrect