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A person with 44A+XXY chromosome set up ...

A person with 44A+XXY chromosome set up has gynaecomastia and is Barr body positive They are symptoms of

A

Turneer's syndrome

B

Klinefelter's syndrome

C

Down 's syndrome f

D

Edward's syndrome

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The correct Answer is:
To solve the question regarding the symptoms of a person with a chromosome set of 44A+XXY, we will follow these steps: ### Step 1: Identify the Chromosomal Composition The individual has a chromosome composition of 44 autosomes (44A) and 2 sex chromosomes (XXY). This indicates that the individual has an extra X chromosome, leading to a total of 47 chromosomes. ### Step 2: Recognize the Condition The presence of an XXY chromosome configuration is characteristic of Klinefelter syndrome. This condition typically occurs due to nondisjunction during meiosis, where an egg with two X chromosomes fuses with a normal Y sperm. ### Step 3: Analyze the Symptoms The symptoms mentioned include gynecomastia (development of breast tissue in males) and being Barr body positive. In Klinefelter syndrome, affected individuals often exhibit gynecomastia due to hormonal imbalances. ### Step 4: Understand Barr Body Formation Barr bodies are inactivated X chromosomes in cells. In normal males (XY), there are no Barr bodies because there is only one X chromosome. In Klinefelter syndrome (XXY), there are two X chromosomes, leading to one Barr body (calculated as n - 1, where n is the number of X chromosomes). ### Step 5: Conclusion Based on the chromosomal composition (XXY), the symptoms (gynecomastia), and the presence of a Barr body, we conclude that these symptoms are indicative of Klinefelter syndrome. ### Final Answer The symptoms described are characteristic of **Klinefelter syndrome**. ---
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