Turner's syndrome is characterized by having:
Correct answer: D. 44 + XO
- A. Trisomy 21
- B. 44 + XXY
- C. Trisomy
- D. 44 + XO
Explanation
Turner's Syndrome is characterized by the complete or partial loss of one of the X chromosomes in females. Turner's syndrome, also known as 45, X, or 44 + XO, is characterized by the complete or partial absence of one of the X chromosomes in females. Instead of the usual 46 chromosomes, individuals with Turner's syndrome have 45 chromosomes, with only one X chromosome (XO) present in most cases. Turner syndrome can cause a variety of medical and developmental problems, including short height, failure of the ovaries to develop and heart defects.
This question appeared on the UHS MDCAT 2015 paper, which you can sit online with every answer explained.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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