A condition where an individual heterozygous for two pairs of linked genes (AaBb) possesses the two dominant genes on one homologous chromosomes pair and two recessive on the other it is said to be
(a) Cis-arrangement
(b) Trans-arrangement
(c) Partly cis partly trans
(d) More than one option is correct

Options

A. Cis-arrangment
B. Trans-arrangement
C. Partly cis partly trans
D. More than one option is correct

Answer

To solve the question regarding the arrangement of linked genes in a heterozygous individual (AaBb), we need to understand the terms cis and trans arrangements.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Cis-arrangement**: This refers to a configuration where two dominant alleles are located on the same homologous chromosome. For example, if we have alleles A and B (dominant) on one chromosome and a and b (recessive) on the other, this is a cis arrangement.
- **Trans-arrangement**: This is the opposite configuration where the dominant alleles are on different homologous chromosomes. For example, A on one chromosome and b on the same chromosome, while a and B are on the other chromosome.
- **Partly cis partly trans**: This means that some dominant alleles are on the same chromosome while others are on different chromosomes.

2. **Analyzing the Given Condition**:
- The individual in the question is heterozygous for two pairs of linked genes (AaBb).
- It is specified that the two dominant genes (A and B) are on one homologous chromosome, while the two recessive genes (a and b) are on the other homologous chromosome.

3. **Identifying the Correct Arrangement**:
- Since the dominant alleles (A and B) are together on one chromosome, this fits the definition of a **cis-arrangement**.
- Therefore, the correct answer is **(a) Cis-arrangement**.

4. **Eliminating Other Options**:
- **Trans-arrangement** cannot be correct because the dominant alleles are not on different chromosomes.
- **Partly cis partly trans** is also incorrect because all dominant alleles are on the same chromosome.
- **More than one option is correct** is not applicable since only one option is valid.

### Final Answer:
The correct answer is **(a) Cis-arrangement**.

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