Question

Variation of temperature can ............. the crossing over frequency.

• A. Decrease
• B. Increase
• C. Gradually increases
• D. Gradually decrease

Answer 1

The correct option is B Increase

There are certain factors which change the rate of crossing over. Temperature changes, shock and radiation exposure can result in a change in the frequency of crossing over. When there is a change in the temperature, there are increased chances of crossing over. Due to the heat supplied, the chromosomes are less stable and this increases the sites of exchange of genetic material.

Thus, the correct answer is option B.