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Questions and Answers
Which of the following disorders is most commonly linked to the X chromosome?
Which of the following disorders is most commonly linked to the X chromosome?
- Turner Syndrome
- Down's Syndrome
- Hemophilia (correct)
- Klinefelter Syndrome
What genetic condition is characterized by having three copies of chromosome 21?
What genetic condition is characterized by having three copies of chromosome 21?
- Turner Syndrome
- Fragile X Syndrome
- Down's Syndrome (correct)
- Klinefelter Syndrome
Which of the following is a characteristic of Turner Syndrome?
Which of the following is a characteristic of Turner Syndrome?
- Presence of an additional X chromosome
- Males affected more commonly
- Monosomy of the X chromosome (correct)
- Trisomy 21
What condition is associated with the chromosomal pattern XXY?
What condition is associated with the chromosomal pattern XXY?
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Which of the following is NOT a recessive X-linked disorder?
Which of the following is NOT a recessive X-linked disorder?
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Study Notes
Genetic & Chromosomal Abnormalities
- Mutations can arise from environmental factors, leading to changes in chromosome number or structure.
- Down's Syndrome is characterized by Trisomy 21, which means there are three copies of chromosome 21.
- Turner Syndrome results from Monosomy, specifically the absence of one X chromosome (XO).
- Klinefelter Syndrome occurs when there is an extra X chromosome, resulting in the XXY configuration.
Sex Linked Inheritance
- Disorders associated with genes located on the sex chromosomes are known as sex-linked inheritance.
- The most prevalent form involves recessive traits found on the X chromosome, which predominantly impacts males due to their single X chromosome.
- Examples of recessive X-linked disorders include:
- Red-Green Color Blindness, a visual impairment affecting the perception of colors.
- Hemophilia, a blood clotting disorder that can cause excessive bleeding.
- Fragile X Syndrome, a genetic condition leading to developmental delays and cognitive impairment.
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