Question

The percent crossing over is high when ________.

• A. genes are unlinked
• B. genes are located on different chromosomes
• C. genes are linked and are very close to each other
• D. genes are linked and far away from each other

Hint:

Distance $\propto$ Recombination (Crossing over) Frequency.

Answer 1

The Correct Option is D

Step 1: Concept
Crossing over involves the exchange of genetic material between non-sister chromatids.
Step 2: Meaning
Linkage is the tendency of genes on the same chromosome to stay together.
Step 3: Analysis
The probability of a crossover occurring between two genes increases as the physical distance between them increases.
Step 4: Conclusion
Therefore, crossing over is high when linked genes are far apart.
Final Answer:(D)