An individual has an additional sex chromosome. Which syndrome does he have?
Correct answer: D. Klinefelter's syndrome
- A. Down's syndrome
- B. Turner's syndrome
- C. Jacob's syndrome
- D. Klinefelter's syndrome
Explanation
Klinefelter's syndrome is a genetic condition in which a boy is born with an extra X chromosome. Jacob's syndrome, XYY syndrome is a genetic condition in which a male has an extra Y chromosome. Down's syndrome is a trisomy 21. The additional chromosome in Down's Syndrome is NOT a sex chromosome. Turner syndrome, a condition that affects only females, results when one of the X chromosomes (sex chromosomes) is missing or partially missing.
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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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