In diploid species, diploid cells may undergo either mitosis or meiosis. Haploid cells may undergo mitosis (for certain species) but not meiosis because Group of answer choices

1. the sister chromatids cannot separate.
2. the synaptonemal complex is too strong.
3. crossing over has occurred.
4. cohesins are no longer present.
5. homologous chromosomes cannot pair.

Meiosis is a kind of division that results in daughter cells with each having their chromosomal number reduced by half. It is used by cells during gamete formation. Meiosis involves two steps of division viz: Meiosis I, in which homologous pairs of chromosomes (similar but non-identical chromosomes received from each parent) separates and Meiosis II, in which sister chromatids (replicated chromosome) separates.

Due to this, meiosis can only occur in diploid cells i.e. cells with two set of chromosomes, where homologous chromosomes will pair up and separate during the anaphase stage. Meiosis cannot occur in an organism whose body cell is haploid i.e. one set of chromosomes, because homologous chromosomes cannot be present in order to pair up for separation during meiosis I.

In other words, only one round of division can occur in haploid cells, which is mitosis, which sister chromatids separate.