All but one event would occur during meiosis i. that is a) homologous chromosomes pair up. b) sister chromatids divide, resulting in haploid cells. c) nuclear membrane form around newly separated chromosomes. d) homologous chromosomes are separated with sister chromatids in place.

Explanation:

During meiosis I,the sister chromatids are still attached at the centromere. In Anaphase I of meiosis I, the homologous chromosomes break their connections and separate out. The process of separation is called  disjunction (dis-separate, junction-union). The separated chromosomes are called dyads (Gk. dyas-two) because each of them consists of two chromatids.

During anaphase II of meiosis II, the two chromatids of a chromosome separate completely forming the daughter chromosomes. At the end of anaphase II, four groups of chromosomes are produced, each group having haploid number.

B)  

sister chromatids divide, resulting in haploid cells.

Explanation: