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Turner's syndrome where individuals are ...

Turner's syndrome where individuals are phenotypically female but have rudimentary sex organs and mammary glands is due to absence of

A

Both x chromosomes

B

Y- chromosomes

C

One X- chromosomes/44+XO

D

X-Y chromosomes

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Turner’s Syndrome**: Turner’s syndrome is a genetic condition that affects females. It is characterized by the presence of only one X chromosome instead of the usual two (XX). 2. **Identifying the Chromosomal Abnormality**: In Turner’s syndrome, the individual has either a missing or partially missing X chromosome. This can be denoted as 45,X or 44,XO, where the "45" represents the total number of chromosomes (including one X chromosome) and "X" indicates the presence of one X chromosome. 3. **Phenotypic Characteristics**: Individuals with Turner’s syndrome are phenotypically female but often exhibit underdeveloped secondary sexual characteristics, such as rudimentary sex organs and mammary glands. This is due to the lack of sufficient estrogen production, which is normally stimulated by the presence of two X chromosomes. 4. **Consequences of the Absence**: The absence of the second X chromosome leads to various developmental issues, including short stature, ovarian failure, and potential heart defects. 5. **Conclusion**: Therefore, the condition of Turner’s syndrome is primarily due to the absence of one X chromosome in females. **Final Answer**: Turner’s syndrome is due to the absence of one X chromosome. ---
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