If a colour bind man marries a woman who is normal but carries this trait, the progeny will be

Options

A. sons and daughters will be normal
B. sons will be colour blind, daughters will be normal
C. sons will be normal, dughters will be carriers
D. both sons and daughters will be color blind

Answer

To solve the question regarding the offspring of a colorblind man and a woman who is normal but carries the trait, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Genetics of Colorblindness**:
- Colorblindness is a sex-linked recessive trait located on the X chromosome.
- The normal vision allele is denoted as X^H and the colorblind allele is denoted as X^h.

2. **Determine the Genotypes of the Parents**:
- The colorblind man has the genotype X^hY (since he has one X chromosome with the colorblind allele and a Y chromosome).
- The woman is normal but a carrier, so her genotype is X^HX^h (one normal allele and one colorblind allele).

3. **Set Up a Punnett Square**:
- Create a Punnett square to predict the genotypes of the offspring. The rows will represent the mother's alleles (X^H and X^h) and the columns will represent the father's alleles (X^h and Y).

| | X^H | X^h |
|---------|-----------|-----------|
| **X^h** | X^HX^h (Carrier Daughter) | X^hX^h (Colorblind Daughter) |
| **Y** | X^HY (Normal Son) | X^hY (Colorblind Son) |

4. **Analyze the Results**:
- From the Punnett square, we can see the possible genotypes of the offspring:
- Daughters:
- 1 X^HX^h (carrier)
- 1 X^hX^h (colorblind)
- Sons:
- 1 X^HY (normal)
- 1 X^hY (colorblind)

5. **Conclude the Progeny Types**:
- The possible outcomes for the progeny are:
- Sons: 50% will be colorblind (X^hY) and 50% will be normal (X^HY).
- Daughters: 50% will be carriers (X^HX^h) and 50% will be colorblind (X^hX^h).

6. **Select the Correct Answer**:
- The correct answer to the question is that the sons will be colorblind and the daughters will be carriers.

### Final Answer:
The progeny will be:
- Sons: 50% colorblind, 50% normal
- Daughters: 50% carriers, 50% colorblind