Mr kapoor has Bb autosomal gene pair and d allele sex linked.What shallbe proportion of Bd in sperms

Options

A. 0
B. `1//2`
C. `1//4`
D. `1//8`

Explanation

To solve the question regarding the proportion of Bd in Mr. Kapoor's sperms, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotype of Mr. Kapoor**:
- Mr. Kapoor has an autosomal gene pair Bb (where B is dominant and b is recessive) and a sex-linked allele D.
- The sex-linked allele D is located on the X chromosome.

2. **Determine the Chromosomes**:
- Mr. Kapoor's genotype can be represented as:
- X^D (X chromosome with D allele)
- Y (Y chromosome)
- Therefore, his complete genotype is X^D, Y for the sex-linked trait and Bb for the autosomal trait.

3. **Gamete Formation**:
- During meiosis, the alleles segregate, and each gamete will receive one allele from each gene pair.
- For the autosomal gene pair Bb, the possible alleles in the gametes are:
- 50% will carry B
- 50% will carry b
- For the sex-linked gene, the possible alleles in the gametes are:
- 50% will carry X^D (from the X chromosome)
- 50% will carry Y (from the Y chromosome)

4. **Combine the Alleles**:
- Now, we combine the outcomes from the autosomal and sex-linked genes to find the combinations in the sperm:
- From X^D:
- X^D with B → BD
- X^D with b → bD
- From Y:
- Y with B → BY
- Y with b → bY

5. **Calculate the Proportions**:
- The possible combinations of the gametes are:
- 1/4 BD (from X^D and B)
- 1/4 bD (from X^D and b)
- 1/4 BY (from Y and B)
- 1/4 bY (from Y and b)
- Therefore, the proportion of sperms carrying the Bd combination is 1/4 or 25%.

6. **Final Answer**:
- The proportion of Bd in Mr. Kapoor's sperms is **25%**.