Which of the following offspring could be produced by a normal homozygous female and a haemophiliac male?

Options

A. normal males and normal females
B. haemophiliac males and normal females
C. normal males and carrier females
D. haemophiliac males and carrier females

Answer

To solve the question of which offspring could be produced by a normal homozygous female and a hemophiliac male, we need to understand the genetics involved in hemophilia and the inheritance patterns.

### Step-by-Step Solution:

1. **Identify the Genotypes**:
- A normal homozygous female for the X-linked trait of hemophilia has the genotype **XX** (both X chromosomes are normal).
- A hemophiliac male has the genotype **XhY** (one X chromosome carries the hemophilia allele, and the Y chromosome does not carry it).

2. **Determine the Gametes Produced**:
- The normal homozygous female (XX) can only produce one type of gamete, which is **X** (normal).
- The hemophiliac male (XhY) can produce two types of gametes: **Xh** (hemophiliac X chromosome) and **Y** (Y chromosome).

3. **Create a Punnett Square**:
- Set up a Punnett square to visualize the possible combinations of gametes from the parents.
- The female contributes **X** (normal), and the male contributes either **Xh** or **Y**.

| | Xh (from male) | Y (from male) |
|-------|----------------|----------------|
| **X** (from female) | XXh (normal female, carrier) | XY (normal male) |

4. **Analyze the Offspring**:
- The possible offspring from this cross are:
- **XXh**: This offspring is a normal female but a carrier for hemophilia (since she has one normal X and one hemophilic X).
- **XY**: This offspring is a normal male (since he has one normal X and one Y).

5. **Conclusion**:
- The offspring produced by a normal homozygous female and a hemophiliac male could be:
- One normal female carrier (XXh)
- One normal male (XY)

### Final Answer:
The offspring could be:
1. A normal female carrier (XXh)
2. A normal male (XY)