An abnormal human baby with `XXX` sex chromosomes was born due to

Options

A. Fusion of two sperm and one ovum
B. Formation of abnormal sperms in the father
C. Formation of abnormal ova in the mother
D. Fusion on two ova and one sperm

Answer

To solve the question regarding the abnormal human baby with `XXX` sex chromosomes, we need to analyze the options provided and understand the underlying genetic mechanisms involved in the condition known as Triple X syndrome.

### Step-by-Step Solution:

1. **Understanding Triple X Syndrome**:
- Triple X syndrome occurs in females who have three X chromosomes instead of the usual two. This condition is also referred to as 47,XXX.

2. **Identifying the Cause**:
- The condition arises due to nondisjunction during meiosis, which is the process of cell division that produces gametes (sperm and ova). Nondisjunction can lead to gametes with an abnormal number of chromosomes.

3. **Evaluating the Options**:
- **Option A: Fusion of two sperm and one ova**: This scenario is unlikely to result in a Triple X condition, as it would typically lead to other chromosomal abnormalities.
- **Option B: Formation of abnormal sperms in the father**: This is incorrect because Triple X syndrome specifically affects females and is not caused by abnormal sperm.
- **Option C: Formation of abnormal ova in the mother**: This is the correct answer, as the abnormality arises from nondisjunction during the formation of the ova, leading to an egg with two X chromosomes.
- **Option D: Fusion of two ova**: This is also incorrect as it does not pertain to the mechanism that causes Triple X syndrome.

4. **Conclusion**:
- The correct answer is **Option C: Formation of abnormal ova in the mother**, as it directly relates to the mechanism that leads to the presence of three X chromosomes in the offspring.

### Final Answer:
The abnormal human baby with `XXX` sex chromosomes was born due to the formation of abnormal ova in the mother.

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