Sex chromosome aneuploidies: Turner is XO and Klinefelter is XXY.
Turner syndrome (45,X) gives females with short stature, infertility and often heart defects, but normal intelligence. Klinefelter (47,XXY) males are tall, have reduced testosterone and often infertility. Sex chromosome aneuploidies are less severe than autosomal ones because extra X chromosomes are inactivated.
Hormone therapy helps.
Sex chromosome aneuploidies: Turner is XO and Klinefelter is XXY.
Turner and Klinefelter Syndromes is one of the 54 topics in Genetics. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Sex Chromosomes, Down Syndrome, Nondisjunction.
XYY males are typically tall and often undiagnosed.
Work through the Beginner topics in Genetics first, such as Heredity, Gene, Allele, then return to Turner and Klinefelter Syndromes. Intermediate topics assume the Beginner vocabulary.
The closest topics to Turner and Klinefelter Syndromes are Sex Chromosomes, Down Syndrome, Nondisjunction, X-Chromosome Inactivation. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Turner and Klinefelter Syndromes. To practise the whole of Genetics, use the Genetics quiz.
Turner and Klinefelter Syndromes: Sex chromosome aneuploidies: Turner is XO and Klinefelter is XXY. Sex Chromosomes: X and Y chromosomes determine biological sex in humans; XX is typically female and XY male. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Sex Chromosomes and explain the difference aloud. Finally, take the Genetics quiz and come back to this page for any question you miss.
X and Y chromosomes determine biological sex in humans; XX is typically female and XY male.
🧬 GeneticsA condition caused by an extra copy of chromosome 21, also called trisomy 21.
🧬 GeneticsFailure of chromosomes to separate in meiosis, producing gametes with extra or missing chromosomes.
🧬 GeneticsOne X chromosome in each female cell is silenced as a Barr body to equalise gene dosage.
🧬 Genetics