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What occurs in crossing over :...

What occurs in crossing over :

A

Recombination

B

Mutation

C

Independent assortment

D

None

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Crossing Over**: - Crossing over is a biological process that occurs during meiosis, specifically during the prophase I stage. It is essential for genetic diversity. 2. **Location of Crossing Over**: - This process takes place in the pachytene stage of prophase I of meiosis. During this stage, homologous chromosomes pair up closely. 3. **Mechanism of Crossing Over**: - During crossing over, segments of genetic material are exchanged between non-sister chromatids of homologous chromosomes. This exchange results in a recombination of genetic material. 4. **Outcome of Crossing Over**: - The result of crossing over is the creation of new combinations of alleles, which increases genetic variation in the gametes produced. 5. **Distinguishing from Other Processes**: - It is important to note that crossing over is not the same as mutation. Mutation refers to changes in the DNA sequence caused by various factors, while crossing over is a natural process during gamete formation. - Additionally, crossing over should not be confused with independent assortment, which refers to the random distribution of alleles during gamete formation. 6. **Conclusion**: - The correct answer to the question "What occurs in crossing over?" is that it involves the recombination of genetic material between non-sister chromatids of homologous chromosomes.
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