Which of the most common mechanism of genetic variation in the population of sexually reproduction organisms

Options

A. Genetic drift
B. Recombination
C. Transduction
D. Chromosome aberration:

Answer

### Step-by-Step Text Solution:

1. **Understanding Genetic Variation**: Genetic variation refers to the differences in DNA sequences among individuals within a population. This variation is crucial for the evolution and adaptation of species.

2. **Mechanisms of Genetic Variation**: In sexually reproducing organisms, genetic variation can arise through several mechanisms:
- **Mutation**: Changes in the DNA sequence that can introduce new alleles.
- **Recombination**: The process where genetic material is shuffled during the formation of gametes.
- **Genetic Drift**: Random changes in allele frequencies in a population due to chance events.
- **Transduction**: The transfer of genetic material between organisms via viruses.
- **Chromosomal Evolution**: Changes in chromosome structure or number.

3. **Identifying the Most Common Mechanism**: Among these mechanisms, recombination is often highlighted as the most common mechanism of genetic variation in sexually reproducing organisms. This occurs during meiosis, specifically during the prophase stage, where homologous chromosomes exchange segments of DNA in a process called crossing over.

4. **Role of Recombination in Meiosis**: During meiosis, the exchange of genetic material between homologous chromosomes leads to new combinations of alleles, contributing significantly to genetic diversity in the offspring.

5. **Conclusion**: Based on the mechanisms discussed, the most common mechanism of genetic variation in sexually reproducing organisms is **recombination**.

### Final Answer:
The most common mechanism of genetic variation in the population of sexually reproducing organisms is **recombination**.

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