Freshly released human egg has

Options

A. one Y chromosome
B. one X chromosome
C. two X chromosome
D. one X chromosome and one Y chromosome

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the composition of a freshly released human egg. In humans, the egg is a female gamete involved in reproduction.

2. **Chromosome Composition**: Human cells typically contain 46 chromosomes, which are organized into 23 pairs. One pair consists of sex chromosomes, which determine the sex of the individual.

3. **Sex Chromosomes in Females**: In females, the sex chromosomes are always XX. This means that females do not possess Y chromosomes; they only have X chromosomes.

4. **Formation of the Egg**: The process of egg formation involves meiosis. Initially, a primary oocyte undergoes meiosis to produce a secondary oocyte and a polar body. The secondary oocyte is what is released during ovulation.

5. **Meiosis and Chromosome Count**: Meiosis is a reductional division that results in gametes being haploid (n). In the case of the human egg, it will have one set of chromosomes, which means it will have one X chromosome.

6. **Evaluating the Options**:
- Option A: 1 Y chromosome - Incorrect, as eggs do not have Y chromosomes.
- Option B: 1 X chromosome - Correct, as the egg contains one X chromosome.
- Option C: 2 X chromosomes - Incorrect, as the egg is haploid and cannot have two X chromosomes.
- Option D: 1 X and 1 Y chromosome - Incorrect, as eggs only contain X chromosomes.

7. **Conclusion**: The correct answer is that a freshly released human egg has **1 X chromosome**.

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