A color - blind man marries a woman who is carrier for hemophilia . Which of the following is true for their progenies ?

Options

A. 25% of the progenies carry the genes for both hemophilia and color - blindness
B. 25% of the progenies carry only the gene for hemophilia
C. 25% of the progenies carry only the gene for color - blindness
D. All of these

Answer

To solve the question regarding the progeny of a color-blind man who marries a woman who is a carrier for hemophilia, we will follow these steps:

### Step 1: Determine the Genotypes
- The color-blind man has the genotype **X^cY** (where X^c represents the X chromosome with the color-blind allele).
- The woman, being a carrier for hemophilia, has the genotype **X^HX^h** (where X^H is the normal allele and X^h is the hemophilia allele).

### Step 2: Identify the Gametes
- The man can produce two types of gametes: **X^c** and **Y**.
- The woman can produce two types of gametes: **X^H** and **X^h**.

### Step 3: Perform a Punnett Square
We will create a Punnett square to visualize the possible combinations of gametes from both parents.

| | X^H | X^h |
|---------|---------|---------|
| **X^c** | X^cX^H | X^cX^h |
| **Y** | X^HY | X^hY |

### Step 4: Analyze the Offspring Genotypes
From the Punnett square, we can determine the genotypes of the progeny:
1. **X^cX^H** - Carrier for color blindness (female)
2. **X^cX^h** - Carrier for color blindness and hemophilia (female)
3. **X^HY** - Normal male (not color blind, not hemophilic)
4. **X^hY** - Hemophilic male (not color blind)

### Step 5: Determine the Phenotypes
Now we analyze the phenotypes based on the genotypes:
- **X^cX^H**: Female carrier for color blindness (25%)
- **X^cX^h**: Female carrier for both color blindness and hemophilia (25%)
- **X^HY**: Normal male (25%)
- **X^hY**: Hemophilic male (25%)

### Conclusion
The progeny will have the following distribution:
- 25% will be carriers of color blindness.
- 25% will be carriers of both color blindness and hemophilia.
- 25% will be normal males.
- 25% will be hemophilic males.

Thus, the correct answer is that all of the above statements regarding the progeny are true.