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Turner syndrome and Klinefelter syndrome fall under the category of genetic disorders. A genetic disorder is a disease caused in part or fully by a change in the DNA sequence. A single gene mutation, many gene mutations, a combination of gene mutations, environmental factors, or chromosome damage can cause such diseases. The disorder-causing mutation might occur spontaneously before embryonic development, or it can be passed down from two parents who are carriers of a faulty gene (autosomal recessive inheritance), or from a parent who has the disorder (autosomal dominant inheritance). Differences in the number of sex chromosomes produce Turner and Klinefelter syndromes, which are hereditary disorders.
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Key Takeaways: Turner Syndrome, Klinefelter Syndrome, Genetic Disorders, Sex Chromosomes, Monosomy
What is Syndrome?
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A syndrome is a collection of medical indications and symptoms that are related to one another and are frequently linked to a specific disease or disorder. The word comes from the Greek word, which means "concurrence." When a syndrome is linked to a specific cause, it is referred to as a disease.
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Turner Syndrome
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Turner syndrome affects only females. It occurs when one of the X chromosomes (sex chromosomes) is absent or partially missing. Turner syndrome can lead to serious medical and developmental issues, including short stature, ovarian failure, and cardiac anomalies.
Turner syndrome can be discovered prenatally, during childhood, or in early adolescence. Turner syndrome is commonly misdiagnosed in girls with mild signs and symptoms until they are in their adolescent or young adult years.
Klinefelter Syndrome
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Klinefelter syndrome is present in males born with an extra copy of the X chromosome. Klinefelter syndrome is a hereditary disorder that affects only men and is frequently diagnosed in adulthood.
Testicular growth can be hampered by Klinefelter syndrome, resulting in smaller-than-normal testicles and lower testosterone levels. Muscle loss, face and body hair loss, and an increase in breast tissue are all possible indications of the condition.
Klinefelter syndrome has a wide range of effects, and not everyone has the same indications and symptoms. Although most men with Klinefelter syndrome do not generate sperm, assisted reproductive treatments may allow some men with Klinefelter syndrome to father children.
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Difference Between Turner Syndrome and Klinefelter Syndrome
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The main differences between Turner’s syndrome and Klinefelter syndrome are given below:
| Basis For Comparison | Turner Syndrome | Klinefelter Syndrome |
|---|---|---|
| Meaning | Turner syndrome is a genetic disorder in which a female is born with a different genetic condition from the typical one. It is characterised by the lack of one of the sex chromosomes (XO instead of XX). | Klinefelter syndrome occurs when a guy is born with a different genetic condition than the usual, in which they have XXY chromosomes instead of the standard XY chromosome. |
| Karyotype | Only one X chromosome is present i.e monosomy of sex chromosome (2n-1). | Males have a trisomy of sex chromosome (2n+1) in this (XXY chromosome). |
| Occurs in | It occurs only in females. | It occurs only in males. |
| Features or Physical appearance | 1. Males and females are both sterile. 2. Breasts that aren't fully formed. 3. Short stature, webbed neck 4. The presence of the uterus, vagina, and vulva, as well as the absence of menstruation. 5. The ovary is absent or underdeveloped. 6. Cardiovascular issues and hearing loss. 7. The female's physical appearance is affected. |
2. Testes are little (less production of testosterone). 3. Sexual organs that have not fully matured, such as the seminal vesicles, penis, and vas deferens. 4. Mentally deficient. 5. Feminine features, such as larger breasts and a feminine-sounding voice. 6. Extremely long limbs. 7. The patients are taller and slimmer. |
| Treatment | Estrogen, growth hormones, and replacement treatment are widely used to treat it. | Hormone therapy and testosterone therapy are two types of therapy used. |
Things to Remember
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- Turner syndrome is caused by the deletion of one of the sex chromosomes (XO instead of XX) in females.
- Turner syndrome is characterised by monosomy of sex chromosome (2n-1), whereas Klinefelter syndrome is characterised by trisomy of sex chromosome (2n+1).
- Klinefelter syndrome causes males to be infertile, and organs such as the testes, penis, vas deferens, and seminal vesicles are tiny and underdeveloped.
- Turner syndrome is typically treated with oestrogen, growth hormones, and replacement therapy.
- Klinefelter syndrome is typically treated with testosterone therapy.
Sample Questions
Ques. Turner syndrome and klinefelter syndrome can be easily studied by analysis of? (2 Marks)
Ans. Turner syndrome and Klinefelter syndromes are diagnosed by the analysis of chromosomal patterns. In Turner syndrome, females lack one X-chromosome (i.e 45, XO), whereas in Klinefelter syndrome males carry an extra X-chromosome (i.e 47, XXY).
Ques. What are the types of genetic disorders? (3 Marks)
Ans. There are 3 types of genetic disorders:
- Single-gene disorders - In such disorders, only a single gene is affected.
- Chromosomal disorders - They arise due to presence or absence of chromosomes (or part of chromosomes).
- Complex disorders - These include disorders characterized by mutations in two or more genes.
Ques. What is the main treatment for turner syndrome? (2 Marks)
Ans. Growth hormone therapy and oestrogen therapy are the most common treatments for those who are affected with turner syndrome. Such patients may also benefit from growth hormone (GH) therapy, which can help them achieve a more typical height.
Ques. What is the treatment for klinefelter's syndrome? (2 Marks)
Ans. Testosterone replacement therapy is a typical treatment for this disease. It can begin throughout adolescence and lead to usual physical changes like facial hair and a deeper voice. It can also aid with penis enlargement and muscle and bone strength, but it has no effect on testicle size or fertility.
Ques. What are monosomy and trisomy chromosomes? (2 Marks)
Ans. A trisomy occurs when a person has three copies of a chromosome rather than the typical two. Monosomy is a condition in which a person has only one chromosome rather than the usual two. Both monosomy and trisomy conditions can lead to serious genetic disorders.
Ques. How are the chromosomes different in Turner syndrome? (3 Marks)
Ans. The majority of people are born with two sets of sex chromosomes. The X chromosome is carried down through the generations from mothers to sons, while the Y chromosome is transmitted from fathers to sons. A female receives one X chromosome from father and one from mother. In Turner’s syndrome, females have one copy of the X chromosome that is missing, partially missing, or mutated.
Ques. Can females be also affected with Klinefelter syndrome? (2 Marks)
Ans. Only males are affected by Klinefelter syndrome, females are not affected. Males with Klinefelter syndrome have an extra copy of the X chromosome, which is caused by a genetic defect. Males with Klinefelter syndrome have a XXY pattern instead of the usual XY chromosomes.
Ques. Why can't males have Turner syndrome? (3 Marks)
Ans. Turner’s syndrome results due to absence or one X-chromosome. Females, in normal conditions, have two X-chromosomes which are responsible for their female characteristics. Lack of an X-chromosome causes little or no growth of secondary sexual characteristics in females. However, males only have a single X-chromosome which they receive from their mother. This X-chromosome do not play any role in growth and development of male secondary sexual characteristics. Thus, males are not affected by turner’s syndrome.
Ques. Which characteristic is commonly associated with Turner syndrome? (2 Marks)
Ans. Turner syndrome is characterised by a short neck with a webbed look, a low hairline at the back of the neck, low-set ears, swollen or puffy hands and feet at birth, and soft nails that bend upward.
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