Question

3. What important event occurs during prophase I of meiosis that does not happen in mitosis?
A. replication of DNA
B. crossing over between homologous chromosomes
C. the nuclear envelope disappears
D. formation of spindle fibers
4. What occurs during crossing over?
A. two complete chromatids switch places
B. chromosomes move the other side of the cell
C. portions of homologous chromosomes interchange
D. chromosome number is cut in half

Answer 1

3. "Replication of DNA" is the important event that occurs during prophase I of meiosis that does not happen in mitosis. The correct option among all the options given in the question is option "A".

4. "Portions of homologous chromosomes interchange" is what occurs during crossing over. The correct option among all the options that are given in the question is the third option or option "C".