A human female with Turner's syndrome

Options

A. Is able to produce children with normal husband
B. Has 45 chromosomes with XO
C. Has one additional X chromosome
D. Exhibits male characters

Answer

**Step-by-Step Solution:**

1. **Understanding Turner Syndrome:**
- Turner syndrome is a genetic condition that affects females. It is characterized by the absence of one X chromosome, resulting in a total of 45 chromosomes instead of the typical 46.

2. **Chromosomal Composition:**
- In Turner syndrome, the chromosomal composition is denoted as 45, XO. This means that there is only one X chromosome present, and no second sex chromosome (either X or Y).

3. **Reproductive Implications:**
- Females with Turner syndrome are typically sterile. This is due to underdeveloped ovaries (referred to as rudimentary ovaries), which do not function properly to produce eggs.

4. **Secondary Sexual Characteristics:**
- Women with Turner syndrome often lack secondary sexual characteristics, which can include breast development and menstruation, further contributing to their infertility.

5. **Evaluating the Options:**
- **Option A:** A human female with Turner syndrome is able to produce children with a normal husband. This is incorrect because they are sterile.
- **Option B:** A human female with Turner syndrome has 45 chromosomes with an XO configuration. This is correct.
- **Option C:** A human female with Turner syndrome has one additional X chromosome. This is incorrect; they have one less X chromosome.
- **Option D:** A human female with Turner syndrome exhibits male characteristics. This is incorrect as it does not correlate with Turner syndrome.

6. **Conclusion:**
- The correct answer is **Option B**, which states that a human female with Turner syndrome has 45 chromosomes with an XO configuration.

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