during which step of meiosis does crossing over occur?
a. prophase i
b. anaphase i
c. telophase i
d. metaphase i

Metaphase

Explanation:

Hope this helps :))

1.  The enzyme dicer cleaves dsRNA to form

small interfering RNA (siRNA).

2.  The siRNA binds to a special protein,  

which degrades one strand.

3. One strand of siRNA associates with the

protein to form an RNase complex.

4. The RNase complex binds to a specific

mRNA and degrades it.