A person has 45 chromosomes in each body cell, with a single X chromosome and no Y chromosome. This person has
Answer and explanation
Correct answer: D. Turner syndrome
- Step 1: A missing sex chromosome (XO) gives 45 chromosomes and Turner syndrome.
Answer
Turner syndrome.
Why not the others: Down syndrome: Down syndrome has 47 chromosomes with an extra chromosome 21. Klinefelter syndrome: Klinefelter syndrome has 47 chromosomes, XXY. Haemophilia: haemophilia is a sex-linked gene disorder and does not change the chromosome number.
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