Biology - Principles of Inheritance and Variation Question with Solution | TestHub

Down's syndrome is caused by the presence of an additional copy of chromosome number 21 (trisomy of 21), which is an autosomal aneuploidy.

Klinefelter's syndrome is caused by the presence of an additional copy of the X-chromosome resulting in a karyotype of 47, XXY. The XO complement is seen in Turner's syndrome. Thus, this is a mismatch.

Haemophilia is a sex-linked recessive disease, which shows its transmission from an unaffected carrier female to some of the male progeny.

Turner's syndrome is caused by the absence of one of the X chromosomes, i.e., 45 with XO. Such females are sterile as ovaries are rudimentary and they have poor sexual development.

Answer: Klinefelter's syndrome - XO complement