What shall be the ratio of hetorozygous, homozygous and colourblind hemizygous in offsprings of a colour blind husbnad & a carrier wife :-

Options

A. `1:1:2`
B. `1:1:1`
C. `2:1:1`
D. `1:2:1`

Answer

To solve the problem of determining the ratio of heterozygous, homozygous, and colorblind hemizygous offspring from a colorblind husband and a carrier wife, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes**:
- The colorblind husband has the genotype X^cY (where X^c represents the X chromosome with the colorblind allele).
- The carrier wife has the genotype X^cX (where X^c represents the X chromosome with the colorblind allele and X represents the normal allele).

2. **Set Up the Punnett Square**:
- Create a Punnett square to visualize the possible combinations of alleles from the parents.
- The mother's alleles (X^c and X) will be on one side, and the father's alleles (X^c and Y) will be on the other side.

3. **Fill in the Punnett Square**:
- The combinations will be:
- X^c from mother and X^c from father → X^cX^c (homozygous colorblind female)
- X from mother and X^c from father → X^cX (heterozygous carrier female)
- X^c from mother and Y from father → X^cY (hemizygous colorblind male)
- X from mother and Y from father → XY (normal hemizygous male)

4. **Count the Offspring Types**:
- From the Punnett square, we can identify the offspring:
- 1 X^cX^c (homozygous colorblind female)
- 1 X^cX (heterozygous carrier female)
- 1 X^cY (hemizygous colorblind male)
- 1 XY (normal hemizygous male)

5. **Determine the Ratios**:
- The offspring types are:
- 1 homozygous colorblind female (X^cX^c)
- 1 heterozygous carrier female (X^cX)
- 1 hemizygous colorblind male (X^cY)
- The normal male (XY) is not included in the count for colorblind or carrier traits.
- Thus, the ratio of homozygous : heterozygous : hemizygous is 1 : 1 : 1.

### Final Answer:
The ratio of heterozygous, homozygous, and colorblind hemizygous offspring is **1 : 1 : 1**.

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